論文 - 小山 佳一
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Sueyoshi Y., Kobayashi R., Mitsui Y., Koyama K. . Liquid–Solid Reaction of MnBi Phase in Bi/Mn Diffusion Couples under a Magnetic Field . Journal of Electronic Materials54 ( 7 ) 5137 - 5142 2025年7月
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Mitsui Y., Watanabe Y., Kobayashi R., Takahashi K., Koyama K. . Effects of Magnetic Field Intensity on the Reaction in Mn/Ga Diffusion Couple . Journal of Electronic Materials54 ( 7 ) 5130 - 5136 2025年7月
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Mitsui Y., Fumoto S., Kobayashi R., Takahashi K., Koyama K. . High Magnetic Field Effects on Phase Transformation Kinetics of ε-Mn-Al Probed Using Differential Thermal Analysis . MATERIALS TRANSACTIONS66 ( 2 ) 230 - 235 2025年2月査読
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Sueyoshi Y., Kobayashi R., Onoue M., Mitsui Y., Umetsu R.Y., Koyama K. . Structural and Magnetic Properties of MnCo<sub>1-</sub><i><sub>x</sub></i>Fe<i><sub>x</sub></i>Ge<sub>1-</sub><i><sub>y</sub></i>Si<i><sub>y</sub></i> (<i>x</i>, <i>y</i> = 0, 0.5) . MATERIALS TRANSACTIONSadvpub ( 0 ) 758 - 763 2025年査読
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Kobayashi R., Fumoto S., Mitsui Y., Takahashi K., Koyama K. . Differential Thermal Analysis of Ferromagnetic Mn55Al45C2 and Mn53Zn2Al45 Under High Magnetic Fields . Journal of Electronic Materials 2025年
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Onoue M., Mitsui Y., Kobayashi R., Umetsu R.Y., Uwatoko Y., Koyama K. . Magnetic field effect on decomposition of Sm2Fe17N3 probed using 57Fe Mössbauer spectroscopy . Interactions245 ( 1 ) 2024年12月
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Koyama K., Mitsui Y., Imatsuji S., Onaka A., Kobayashi R., Onoue M., Onodera R. . Study of heat treatment effect on magnetic properties of MnFeGe using <sup>57</sup>Fe Mössbauer spectroscopy . Interactions245 ( 1 ) 2024年12月査読
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Mitsui Y., Baba K., Kobayashi R., Onoue M., Ito W., Kuzuhara S., Koyama K. . High magnetic field effects on the phase separation behaviour of Fe-15mass%Cu alloys probed by 57Fe Mössbauer spectroscopy . Interactions245 ( 1 ) 2024年12月
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Kobayashi R., Mitsui Y., Yoshizaki Y., Takahashi K., Takamine K., Koyama K. . Controlling the growth of yeast by culturing in high magnetic fields . Journal of Magnetism and Magnetic Materials586 2023年11月査読
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Takaoka T., Mitsui Y., Koyama K., Fujii S. . Site Selectivity and Structural Stabilization in Cu-Doped or Fe-Doped MnCoGe . MATERIALS TRANSACTIONS64 ( 9 ) 2109 - 2112 2023年9月査読
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Nakamoto K., Mitsui Y., Kobayashi R., Koyama K. . In-Magnetic-Field Heat Treatment Effects on Phase Growth of Mn–Bi–Sn Composite . MATERIALS TRANSACTIONS64 ( 9 ) 2113 - 2117 2023年9月査読
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Masahira ONOUE, Yoshifuru MITSUI, Saki IMATSUJI, Ryota KOBAYASHI, Reisho ONODERA, Keiichi KOYAMA . Magnetic Properties of MnFeGe Probed Using 57Fe Mössbauer-spectroscopy . JPS Conference Proceedings38 - 011139 2023年5月査読
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Yoshifuru MITSUI, Hideto TANAKA, Masahira ONOUE, Moriharu NAGANO, Ryota KOBAYASHI, Rie Y. UMETSU, Keiichi KOYAMA . Magnetic and Hyperfine Properties of FeZnSb . JPS Conference Proceedings38 011138 2023年5月査読
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Onaka A., Onoue M., Onodera R., Mitsui Y., Koyama K. . Magnetic and structural properties of Fe-substituted MnCoGe with Ni<inf>2</inf>In-type structure . Journal of Magnetism and Magnetic Materials563 170000 - 170000 2022年12月査読
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Takahashi J., Mitsui Y., Onoue M., Kobayashi R., Koyama K. . Nitridation kinetics of Sm<inf>2</inf>Fe<inf>17</inf> probed using Mössbauer spectroscopy . Journal of Magnetism and Magnetic Materials554 2022年7月査読
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Fujii S., Mitsui Y., Koyama K. . Ab initio Study of Atomic-disorder Effect on Electronic and Magnetic Properties of CrAGe . Journal of the Physical Society of Japan91 ( 6 ) 2022年6月査読
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Kobayashi R., Mitsui Y., Umetsu R.Y., Takahashi K., Koyama K. . Acceleration of B2/L2<inf>1</inf> order-disorder transformation in Ni<inf>2</inf>MnAl Heusler alloys by in-magnetic-field annealing . Journal of Magnetism and Magnetic Materials547 2022年4月査読
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Mitsui Y., Onoue M., Kobayashi R., Sato K., Kuzuhara S., Ito W., Takahashi K., Koyama K. . High Magnetic Field Effects on Cu-precipitation Behavior of Fe-1mass%Cu at 773 K . ISIJ International62 ( 3 ) 413 - 417 2022年3月査読
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Hiroi M. . High magnetic field properties in Ru2-xFexCrSi with antiferromagnetic and spin-glass states . Physical Review B103 ( 9 ) 2021年3月査読
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Kobayashi Ryota, Mitsui Yoshifuru, Umetsu Rie Y., Mizuguchi Masaki, Koyama Keiichi . Synthesis of Ferromagnetic τ-Mn–Al–C by Reactive Sintering . MATERIALS TRANSACTIONS62 ( 1 ) 130 - 134 2021年査読
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Kobayashi Ryota, Takaki Akio, Mitsui Yoshifuru, Umetsu Rie Y., Takahashi Kohki, Mizuguchi Masaki, Koyama Keiichi . Dual Acceleration of ε-τ Transformation in Mn–Al Induced by Zn-Addition and In-Magnetic-Field Annealing . MATERIALS TRANSACTIONS62 ( 1 ) 124 - 129 2021年査読
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Yumi Watanabe, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Keiichi Koyama . Magnetic-field-induced selective retardation of reaction in Mn/Ga diffusion couple . Journal of Alloys and Compounds887 161310 - 161310 2021年査読
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Shun Nakagawa, Yoshifuru Mitsui, Ryota Kobayashi, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama . Magnetic-field-induced decomposition in Cu2MnAl Heusler alloys . Journal of Magnetism and Magnetic Materials540 168411 - 168411 2021年査読
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Y. Mitsui, Y. Takanaga, R. Kobayashi, K. Koyama . Effect of carbon addition on the phase stability of hcp-Mn-Al . Physics B595 412379 2020年10月査読
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M Onoue, R Kobayashi, Y Mitsui, RY Umetsu, Y Uwatoko, K Koyama . Magnetic field-induced nitridation of Sm2Fe17 . J. Alloys Comp.835 155193 2020年9月査読
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Noguchi K., Mitsui Y., Hiroi M., Umetsu R.Y., Gouchi J., Uwatoko Y., Koyama K. . Effects of Substituted Elements on Spin Reorientation in Mn[2-x]Fe[x]Sb[1-y]Sn[y] . MATERIALS TRANSACTIONS61 ( 8 ) 1492 - 1495 2020年8月査読
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Koyama K., Onoue M., Kobayashi R., Mitsui Y., Umetsu R.Y., Uwatoko Y. . Magnetic Field Effect on Nitrogenation of Sm₂Fe₁₇ . MATERIALS TRANSACTIONS61 ( 8 ) 1487 - 1491 2020年8月査読
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K Noguchi, Y Mitsui, M Hiroi, RY Umetsu, J Gouchi, Y Uwatoko, K Koyama . Effects of Substituted Elements on Spin Reorientation in Mn2-xFexSb1-ySny . Mater. Trans.61 ( 8 ) 1492 - 1495 2020年8月査読
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K Nagano, Y Okubo, Y Mitsui, K Koyama, S Fujii . Ab-Initio Study on Structural and Magnetic Properties of Fe-Doped MnCoGe . Mater. Trans.61 ( 8 ) 1434 - 1437 2020年8月査読
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三井好古,尾上昌平,小山佳一 . 磁場中反応を利用した選択的磁性材料合成 . まてりあ59 ( 8 ) 422 - 428 2020年8月査読
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Deguchi T., Matsubayashi K., Uwatoko Y., Koyama T., Kohara T., Nakamura H., Mitsui Y., Koyama K. . Magnetic Measurements of Narrow-Gap Semiconductor FeSb₂ under High Pressure . MATERIALS TRANSACTIONS61 ( 8 ) 1476 - 1479 2020年7月招待 査読
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Tanaka A., Yoshinaga S., Mitsui Y., Sasaki H., Kanomata T., Koyama K. . Magnetic Properties of Weak Itinerant Electron Ferromagnet Au₄V . MATERIALS TRANSACTIONS61 ( 8 ) 1473 - 1475 2020年7月査読
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Y. Mitsui, T. Hagio, K. Takahashi, K. Koyama, . High magnetic field effects on the solid-liquid reaction of Fe-Ga system . ISIJ International60 ( 4 ) 807 - 811 2020年4月査読
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Noguchi K., Kobayashi R., Mitsui Y., Umetsu R., Gouchi J., Uwatoko Y., Koyama K. . Heat treatment effect on the magnetic properties and martensitic transformations of MnCoGe . Journal of Magnetism and Magnetic Materials499 2020年4月査読
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濵﨑貢、⼭⼝光⾂、陳麗、⼩原益⼰、三井好古、⼩⼭佳⼀ . 光の回折と干渉の現象を調べる教材の開発と実験 . 鹿児島大学紀要52 7 - 14 2019年12月
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Watanabe Y., Hagio T., Kobayashi R., Mitsui Y., Koyama K. . Phase formation of a solid-liquid MnGA diffusion couple under a magnetic field . MATERIALS TRANSACTIONS60 ( 10 ) 2195 - 2198 2019年10月査読
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Onoue M., Kobayashi R., Mitsui Y., Umetsu R., Uwatoko Y., Koyama K. . In-Field Heat Treatment Effect on Nitridation of Sm₂Fe₁₇ . MATERIALS TRANSACTIONS60 ( 10 ) 2179 - 2182 2019年10月査読
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小林領太、三井好古、梅津理恵、高橋弘紀、水口将輝、小山佳一 . 磁場印加による強磁性 τ-Mn-Al への相変態の促進 . 日本金属学会誌83 ( 6 ) 181 - 185 2019年査読
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S. Eto, Y. Fukuda, Y. Mitsui, M. Ito, K. Koyama and S. Fujii . Stable Structure, Magnetic and Electronic Properties of (Mn,Cr)AlGe . J. Phys. Soc. Jpn.88 064709 2019年査読
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Y. Watanabe, T. Hagio, R. Kobayashi, Y. Mitsui, K. Koyama . Phase Formation of a Solid-Liquid MnGa Diffusion Couple under a Magnetic Field . Mater. Trans. 60 2195 - 2198 2019年査読
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M. Onoue, R. Kobayashi, Y. Mitsui, R. Y. Umetsu, Y. Uwatoko, K. Koyama . In-Field Heat Treatment Effect on Nitridation of Sm2Fe17 . Mater. Trans. 60 2179 - 2182 2019年査読
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R. Kobayashi, Y. Mitsui, K. Takahashi, S. Uda, K. Koyama . In-field annealing and quenching for ferromagnetic MnBi under 19 T . IEEE Trans. on Magn.55 1000204 2019年査読
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Y. Mitsui, R. Kobayashi, Y. Takanaga, A. Takaki, R.Y Umetsu, K. Takahashi, M. Mizuguchi, K. Koyama . Different Magnetic Field Effects on the ϵ-τ Phase Transformation Between (Mn, Zn)-Al and Mn-Al-C . IEEE Trans. on Magn.55 2100704 2019年査読
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H. Masumitsu, S. Yoshinaga, Y. Mitsui, R.Y. Umetsu, M. Hiroi, Y. Uwatoko, K. Koyama . Weak itinerant-electron ferromagnetism of CrAlGe modified by 3d transition metal . J. Magn. Magn. Mater.492 165677 2019年査読
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濵﨑貢、⼭⼝光⾂、陳麗、⼩原益⼰、三井好古、⼩⼭佳⼀ . 身近な材料を用いた金属の比熱を測定する教材の開発 . 鹿児島大学理学部紀要51 9 - 13 2018年12月
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濵﨑貢、⼭⼝光⾂、陳麗、⼩原益⼰、三井好古、⼩⼭佳⼀ . 音を可視化して音の速さと振動数・波長を測定する教材の開発 . 鹿児島大学理学部紀要51 1 - 8 2018年12月
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Noguchi K., Masumitsu H., Mitsui Y., Umetsu R., Hiroi M., Uwatoko Y., Koyama K. . Magnetic properties of Mn<inf>1-x</inf>TM<inf>x</inf>AlGe (TM = V, Fe, Cu) with Cu<inf>2</inf>Sb-type structure . AIP Advances8 ( 10 ) 2018年10月査読
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K. Noguchi, H. Masumitsu, Y. Mitsui, R.Y. Umetsu, M. Hiroi, Y. Uwatoko, K. Koyama, . Magnetic properties of Mn1-xTMxAlGe (TM = V, Fe, Cu) with Cu2Sb-type structure . AIP Advances 8 101433 2018年10月査読
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H. Masumitsu, S. Yoshinaga, Y. Mitsui, R.Y. Umetsu, M. Hiroi, Y. Uwatoko, K. Koyama . Cu-substitution effects on the magnetic properties of weak itinerant electron ferromagnet CrAlGe . AIP Advances 8 101426 2018年10月査読
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Y. Okubo, S. Eto, Y. Mitsui, K. Koyama, S. Fujii . Ab initio investigation of Fe substitution effect on magnetostructural transition of CoMnGe . AIP Advances 8 101432 2018年8月査読
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Masumitsu H., Yoshinaga S., Mitsui Y., Umetsu R., Hiroi M., Uwatoko Y., Koyama K. . Magnetic and structural properties of Mn<inf>1−</inf><inf>x</inf>Cr<inf>x</inf>AlGe (0 ≤ x ≤ 1.0) . Journal of Magnetism and Magnetic Materials456 104 - 107 2018年6月査読
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Hiroi M., Ishikuma S., Shigeta I., Koyama K., Kondo A., Kindo K., Manaka H., Terada N. . Magnetization and magnetic phase diagram of Heusler compounds Fe<inf>3-y</inf>(Mn<inf>1-x</inf>V <inf>x</inf> ) <inf>y</inf> Si (y = 1 and 1.5) . Journal of Physics: Conference Series969 ( 1 ) 2018年4月査読
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Yoshinaga S., Mitsui Y., Umetsu R., Uwatoko Y., Koyama K. . Pressure effect on magnetic properties of weak itinerant electron ferromagnet CrAlGe . Journal of the Physical Society of Japan87 ( 1 ) 2018年1月査読
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Y. Mitsui, R.Y Umetsu, K. Takahashi, K. Koyama . Reactive sintering process of ferromagnetic MnBi under high magnetic fields . J. Magn. Magn. Mater.453 231 - 235 2018年査読
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Y. Mitsui, Y. Matsumoto, Y. Uwatoko, M. Hiroi, K. Koyama . Magnetic relaxation dynamics in thermally arrested Cr-modified Mn2Sb . J. Magn. Magn. Mater.461 62 - 68 2018年査読
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Y. Mitsui, K. Koyama, M. Ohtsuka, R.Y. Umetsu, R. Kainuma, K. Watanabe . High field X-ray diffraction study for Ni46.4Mn38.8In12.8Co2.0 metamagnetic shape memory film . Metals7 364 2018年査読
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S. Yoshinaga, Y. Mitsui, R. Y. Umetsu, Y. Uwatoko, K. Koyama . Pressure effect on magnetic properties of weak itinerant electron ferromagnet GrAlGe . J. Phys. Soc. Jpn87 014701 2018年査読
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M. Onoue, R. Kobayashi, Y. Mitsui, M.Hiroi, K. Takahashi, A. Kondo, K. Kindo, Y. Uwatoko, K. Koyama . Magnetic and Structural Properties of MnCoGe with Minimal Fe and Sn Substitution . Mater. Trans. 59 1645 - 1650 2018年査読
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M. Hiroi, S. Ishikuma, I. Shigeta, K. Koyama, A. Kondo, K. K., H. Manaka, N. Terada . Magnetization and magnetic phase diagram of Heusler compounds Fe3−y(Mn1−xVx)ySi (y= 1 and 1.5) . J. Phys.: Conf. Ser.969 012099-1 - 012099-4 2018年査読
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H. Masumitsu, S. Yoshinaga, Y. Mitsui, R.Y. Umetsu, M. Hiroi, Y. Uwatoko, K. Koyama . Magnetic and structural properties of Mn1-xCrxAlGe (0 ≤ x ≤ 1.0) . J. Magn. Magn. Mater. 456 104 - 107 2018年査読
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A.N. Nwodo, R. Kobayashi, T. Wakamori, Y. Matsumoto, Y. Mitsui, R.Y. Umetsu, M. Hiroi, K. Takahashi, Y. Uwatoko, K. Koyama . Magnetic Phase Transition of Mn1.9Fe0.1Sb0.9Sn0.1 . IEEE Magn. Lett.9 1400204-1 - 1400204-4 2018年査読
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R. Kobayashi, Y. Mitsui, K. Takahashi, S. Uda, K. Koyama . In-field annealing and quenching for ferromagnetic MnBi under 19 T . IEEE Trans. on Magn.55 1000204-1 - 1000204-4 2018年査読
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Y. Mitsui, R. Kobayashi, Y. Takanaga, A. Takaki, R.Y Umetsu, K. Takahashi, M. Mizuguchi, K. Koyama . Different Magnetic Field Effects on the ϵ-τ Phase Transformation Between (Mn, Zn)-Al and Mn-Al-C . IEEE Trans. on Magn.55 2100704-1 - 2100704-4 2018年査読
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Nwodo A., Kobayashi R., Wakamori T., Matsumoto Y., Mitsui Y., Hiroi M., Takahashi K., Umetsu R., Uwatoko Y., Koyama K. . Quasi-First Order Magnetic Transition in Mn₁.₉Fe₀.₁Sb₀.₉Sn₀.₁ . MATERIALS TRANSACTIONS59 ( 3 ) 348 - 352 2018年査読
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小山佳一、山下美咲、小林領太、三井好古、高橋弘紀、宇田聡 . 15T級強磁場中小型急冷炉の開発 . 鹿児島大学理学部紀要50 1 - 5 2017年12月
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小山佳一、島田大輔、安達義也、三井好古、廣井政彦、上床美也 . 高圧力下におけるMn2Sb1-xGex (x = 0.05, 0.8, 0.1)の磁気特性 . 鹿児島大学理学部紀要50 12 - 18 2017年12月
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小山佳一、平敦志、三井好古、高橋弘紀 . 強磁場中固相焼結で合成したMnBiの特性評価 . 鹿児島大学理学部紀要50 6 - 11 2017年12月
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Mitsui Y. . High field X-ray diffraction study for Ni<inf>46.4</inf>Mn<inf>38.8</inf>In<inf>12.8</inf>Co<inf>2.0</inf> metamagnetic shape memory film . Metals7 ( 9 ) 2017年9月査読
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D. Miyazaki, Y. Mitsui, R. Y. Umetsu, K. Takahashi, S. Uda, K. Koyama . Enhancement of the Phase Formation Rate during In-Field Solid-Phase Reactive Sintering of Mn-Bi . Mater. Trans.58 720 - 728 2017年4月査読
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R. Kobayashi, Y. Mitsui, R.Y. Umetsu, K. Takahashi, M. Mizuguchi, K. Koyama . Annealing temperature and magnetic field effects for ε−τ transformation in Mn-Al alloys . IEEE Magn. Lett.8 1400704 2017年1月査読
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S. Yoshinaga, Y. Mitsui, R.Y. Umetsu, Y. Uwatoko, K. Koyama . Magnetic properties of weak itinerant electron ferromagnet CrAlGe . J. Phys. Conf. Ser.868 012018 2017年1月査読
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S. Yoshinaga, S. Miura, T. Kanomata, Y. Mitsui, K. Koyama . Pressure Effect on Magnetism of Weak Itinerant Electron Ferromagnet Ni74.6Al25.4 . IEEE Magn. Lett.8 140043 2017年1月査読
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T. Wakamori, Y. Mitsui, K. Takahashi, R.Y. Umetsu, Y. Uwatoko, M. Hiroi, K. Koyama . Thermal Transformation Arrest Phenomena in Mn2Sb0.9Sn0.1 . IEEE Magn. Lett.8 1402404 2017年1月査読
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M. Hiroi, T. Tazoko, H. Sano, I. Shigeta, K. Koyama, A. Kondo, K. Kindo, H. Manaka, N. Terada . High-field magnetization of Heusler compound Fe2Mn1-xVxSi . Phys. Rev. B95 014410 2017年1月査読
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M. Hiroi, H. Sano, T. Tazoko, I. Shigeta, M. Ito, K. Koyama, H. Manaka, N, Terada, M. Fujii, A. Kondo, K. Kindo . Magnetic and electrical properties of Heusler compounds Ru2Cr1-xXxSi (X = V, Ti) . J. Alloys. Comp.694 1376 - 1382 2017年1月査読
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M. Yamashita, K. Abematsu, K. Takahashi, Y. Mitsui, K. Koyama . Development of a compact quenching furnace used under high magnetic fields . IEEE Magn. Lett.8 1400704 2017年1月査読
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R. Kobayashi, Y. Mitsui, R.Y. Umetsu, K. Takahashi, M. Mizuguchi, K. Koyama . Magnetic-Field-Induced Acceleration of Phase Formation in τ-Mn-Al . Mater. Trans.58 1511 - 1518 2017年査読
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Shigeta I. . Fabrication and characterization of epitaxial films of superconductor NbN and highly spin-polarized heusler alloy Co<inf>2</inf>2Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si . IEEE Magnetics Letters8 1 - 5 2017年査読
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Kobayashi R. . Effects of Annealing Temperature and Magnetic Field on the ϵ-τ Phase Transformation in Mn-Al Alloys . IEEE Magnetics Letters8 2017年査読
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Yamashita M., Abematu K., Takahashi K., Mitsui Y., Koyama K. . Development of a Compact Quenching Furnace for Use in High Magnetic Fields . IEEE Magnetics Letters8 2017年査読
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Hiroi M., Sano H., Tazoko T., Shigeta I., Ito M., Koyama K., Manaka H., Terada N., Fujii M., Kondo A., Kindo K. . Magnetic and electrical properties of Heusler compounds Ru2Cr1−xXxSi (X = V, Ti) . Journal of Alloys and Compounds694 1376 - 1382 2017年
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X. F. Miao, Y. Mitsui, A. Iulian Dugulan, L. Caron, N. V. Thang, P. Manuel, K. Koyama, K. Takahashi, N. H. van Dijk, and E. Brück . Kinetic-arrest-induced phase coexistence and metastability in (Mn,Fe)2(P,Si) . Phys. Rev. B94 094426 2016年12月査読
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M. Onoue, K. Ozono, Y. Mitsui, M. Hiroi, R.Y. Umetsu, Y. Uwatoko, K. Koyama . Magnetic properties of MnCo1-xFexGe (x = 0.08, 0.12) . 鹿児島大学理学部紀要49 11 - 15 2016年12月
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A. Takaki, Y. Mitsui, D. Miyazaki, R.Y. Umetsu, K. Takahashi, K. Koyama . Magnetic field effects on the morphology of Bi-Mn alloy prepared by solid-phase reactive sintering . 鹿児島大学理学部紀要49 17 - 21 2016年12月
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Y. Matsumoto, K. Matsubayashi, Y. Uwatoko, M. Hiroi, Y. Mitsui, K. Koyama . Magnetic Properties of Mn1.9Cu0.1Sb under High Pressure . AIP Conf. Proc.1763 0020005 2016年8月査読
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K. Abematsu, Y. Mitsui, A. Taira, D. Miyazaki, A. Takaki, R.Y. Umetsu, K. Takahashi, K. Koyama . Magnetic Field Effects on Reactive Sintering of MnBi . AIP Conf. Proc. 1763 0020010 2016年8月査読
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T. Wakamori, Y. Mitsui, K. Takahashi, R.Y. Umetsu, M. Hiroi, K. Koyama . High Field X-ray Diffraction Measurements of Mn2Sb0.95Ge0.05 . AIP Conf. Proc. 1763 0020006 2016年8月査読
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K. Ozono, Y. Mitsui, R. Y. Umetsu, M. Hiroi, K. Takahashi, K. Koyama . Magnetic and Structural Properties of MnCo1-xFexGe (0 ≤ x ≤ 0.12) . API Conf. Proc.1763 002003 2016年8月査読
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K. Ozono, Y. Mitsui, M. Hiroi, R.Y. Umetsu, K. Takahashi, K. Matsubayashi, Y. Uwatoko, K. Koyama . Magnetic and Structural Properties of Metamagnetic MnCo0.92Fe0.08Ge Compound . Mater. Trans.57 ( 3 ) 316 - 320 2016年3月査読
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小野寺礼尚、 大武和樹、高橋弘紀、木村尚次郎、渡辺和雄、小山佳一 . 高温・強磁場中磁化測定によるFeRh合金のメタ磁気相転移の観測 . 日本金属学会誌80 ( 3 ) 186 - 191 2016年3月査読
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Y. Mitsui, K. Abematsu, R.Y. Umetsu, K. Takahashi, K. Koyama . Magnetic field effects on liquid-phase reactive sintering of MnBi . J. Magn. Magn. Mater.400 304 - 306 2016年1月査読
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Ozono K., Mitsui Y., Umetsu R., Hiroi M., Takahashi K., Koyama K. . Magnetic and Structural Properties of MnCo<inf>1-x</inf>FexGe (0 ≤ x ≤ 0.12) . AIP Conference Proceedings1763 2016年査読
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D. Miyazaki, Y. Mitsui, K. Abematsu, K. Takahashi, K. Watanabe, S. Uda, K. Koyama . In-situ observation and differential thermal analysis of MnBi in high magnetic fields . Physics Procedia75 1324 - 1331 2015年12月査読
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S. Yoshinaga, Y. Mitsui, R.Y. Umetsu, K. Koyama . Magnetic properties of Cr-based ternary compound CrAlGe . Physics Procedia75 918 - 925 2015年12月査読
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Y. Mitsui, Y. Yoshimine, R.Y. Umetsu, K. Matsubayashi, Y. Uwatoko, M. Hiroi, K. Koyama . Pressure Effect on the Martensitic Transformation and Magnetic Properties of Mn2−xNi1+xGa . 鹿児島大学理学部紀要48 35 - 39 2015年12月
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K. Koyama, D. Shimada, Y. Adachi, H. Orihashi, D. Mitsunaga, M. Hiroi, Y. Mitsui, S. Kimura, K. Matsubayashi, Y. Uwatoko . Magnetic and electrical properties of Mn2Sb1−xZx (Z = Ge, Sn) under high pressures and high magnetic fields . Rep. Fac. Sri., Kagoshima Univ.48 15 - 21 2015年12月
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R. Onodera, S. Kimura, K. Watanabe, Y. Yokoyama, A. Makino, K. Koyama . Nucleation control for fine nano crystallization of Fe-based amorphous alloy by high-magnetic-field annealing . J. Alloys Comp.637 213 - 218 2015年7月査読
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Mitsui Y., Ikehara Y., Takahashi K., Kimura S., Miyamoto G., Furuhara T., Watanabe K., Koyama K. . Fe-Feinf3/infC binary phase diagram in high magnetic fields . Journal of Alloys and Compounds632 251 - 255 2015年5月
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Y. Mitsui, Y. Ikehara, K. Takahashi, S. Kimura, G. Miyamato, F. Furuhara, K. Watanabe, K. Koyama . Fe-Fe3C binary phase diagram in high magnetic fields . J. Alloys Comp.632 251 - 255 2015年3月査読
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Yoshifuru Mitsui, Yuki Yoshimine, Rie Y. Umetsu, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masahiko Hiroi, Keiichi Koyama . Pressure Effect on the Martensitic Transformation and Magnetic Properties of Mn2-xNi1+xGa . 鹿児島大学理学部紀要48 35 - 39 2015年
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Goto J., Kakimoto T., Fujii S., Koyama K. . Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn₂₋xMxSb (M = Ti, Cr, Co, or Cu) . MATERIALS TRANSACTIONS56 ( 3 ) 415 - 423 2015年査読
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Y. Mitsui, R.Y. Umetsu, K. Koyama and K. Watanabe . Magnetic-field-induced enhancement for synthesizing ferromagnetic MnBi phase by solid-state reaction sintering . J. Alloys Comp.615 131 - 134 2014年12月査読
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小山佳一, 五十嵐利行, 渡辺和雄 . HfV2の強磁場と高圧下における磁気的,熱伝的及び構造的特性 . 鹿児島大学理学部紀要47 13 - 19 2014年12月
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T.M. Pan,C.H. Chen, J.L. Her, K. Koyama . Comparison of structural and electrical properties of Lu2O3 and Lu2TiO5 gate dielectrics for alpha-InGaZnO thin-film transistors . J. Appl. Phys.116 ( 19 ) 194510 - -4 2014年11月査読
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J.L. Her, T.M. Pan, J.H. Liu, H.J. Wang, C.H. Chen, K. Koyama . Electrical characteristics of GdTiO3 gate dielectric for amorphous InGaZnO thin-film transistors . Thin Solid Films569 6 - 9 2014年10月査読
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Y. Mitsui, K. Koyama, K. Oikawa, K. Watanabe . Magnetic field effect on the liquid boundary of Bi-Mn binary system . AIP Conference Proceedings1618 269 - 272 2014年10月
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T.M. Pan, F.H. Chen, M.N. Hung, J.L. Her, K. Koyama . Structural Properties and Electrical Characteristics of High-kappa Tm2O3 Gate Dielectrics for InGaZnO Thin Film Transistors . Sci. Adv. Mater. 6 ( 9 ) 1973 - 1978 2014年9月査読
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M. Yamamoto, K. Magishi, A. Hisada, T. Saito, K. Koyama, M. Takusari, H. Kato, C. Sekine . NMR Study of Filled Skutterudite Pr0.9Ce0.1Ru4P12 . JPS Conf. Proc.3 011003 (6 pages ) 2014年6月査読
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三井 好古, 池原 佑基, 高橋 弘紀, 渡辺 和雄, 小山 佳一 . 強磁場中示差熱分析によるFe-Cのα→γ変態に対する強磁場効果 . 熱測定41 ( 2 ) 43 - 48 2014年4月査読
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R. Onodera, S. Kimura, K. Watanabe, Y. Yokoyama, A. Makino and K. Koyama . Crystallization kinetics of high iron concentration amorphous alloys under high magnetic fields . J. Alloys Comp.604 8 - 11 2014年4月査読
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K. Abematsu, R.Y. Umetsu, R. Kainuma, T. Kanomata, K. Watanabe and K. Koyama . Structural and magnetic properties of magnetic shape memory alloy Ni46Mn41In13 under magnetic fields . Mater. Trans. 55 477 - 481 2014年4月査読
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三井好古、小山佳一、淡路智、渡辺和雄 . 強磁場中熱分析 -相平衡への強磁場効果 . 低温工学49 ( 1 ) 11 - 18 2014年1月査読
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T.M. Pan, H.C. Chen, J.H. Liu, F.H. Chen, J.L. Her, K. Koyama . Comparison of High-kappa Gd2O3 and GdTiO3 alpha-InGaZnO Thin-Film Transistors . IEEE TRANSACTIONS ON ELECTRON DEVICES61 ( 1 ) 87 - 91 2014年1月査読
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S. Mondal, J.L Her,K. Koyama, T.M. Pan . Resistive switching behavior in Lu2O3 thin film for advanced flexible memory applications . NANOSCALE RESEARCH LETTERS9 3(8) 2014年1月査読
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T.M. Pan, C.H. Chen, J.H. Liu, J.L. Her and. K. Koyama . Electrical and reliability characteristics of high-kappa HoTiO3 alpha-InGaZnO thin-film transistors . IEEE Trans. Device Lett35 66 - 68 2014年1月査読
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Y. Yoshimine, D. Mitsunaga, H. Orihashi, D. Shimada, M. Hiroi, R. Onodera, S. Kimura, K. Takahashi and K. Koyama . Magnetic and electrical properties of Mn2-xNi1+xSb . IEEE Trans. Magn50 1001204 - -4 2014年1月査読
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K. Ohtake, Y. Mitsui, K. Takahashi, R. Onodera,S. Kimura, K. Watanabe and K. Koyama . X-ray diffraction measurements of the Fe-Rh alloy under high magnetic fields and at high temperatures . IEEE Trans. Magn.50 1001404 - -4 2014年1月査読
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Y. Matsumoto, H. Orihashi, K. Matsubayashi, Y. Uwatoko, M. Hiroi, K. Koyama . Magnetic field effect on magnetic and electrical properties of Mn2-xCuxSb . IEEE Trans. Magn.50 1000704 - -4 2014年1月査読
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T. Tsutaoka, K. Obata, S. Cheyvuth and K. Koyama . Magnetic phase transitions in Er7Rh3 studied on single crystals . J. Alloy Comp.606 214 - 218 2014年査読
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S. Mondal, J.L.Her, K. Koyama, and T.M Pan . Resistive switching behavior in Lu2O3 thin film for advanced flexible memory applications . Nanoscale Research Lett.9 3 2014年査読
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Pan T., Chen F., Hung M., Her J., Koyama K. . Structural properties and electrical characteristics of high-κ Tm2O3 gate dielectrics for InGaZnO thin film transistors . Science of Advanced Materials6 ( 9 ) 1973 - 1978 2014年
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Kakimoto T., Goto J., Fujii S., Koyama K., Ishida S. . Electronic and Magnetic Properties of Mn₂Sb₁₋xAs[x] (x = 0, 0.5, 1) . MATERIALS TRANSACTIONS55 ( 12 ) 1878 - 1884 2014年
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Mitsui Y., Koyama K., Oikawa K., Watanabe K. . Magnetic field effect on the liquidus boundary of Bi-Mn binary system . AIP Conference Proceedings1618 269 - 272 2014年査読
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Abematsu K., Umetsu R., Kainuma R., Kanomata T., Watanabe K., Koyama K. . Structural and magnetic properties of magnetic shape memory alloy Ni <inf>46</inf>Mn<inf>41</inf>In<inf>13</inf> under magnetic fields . MATERIALS TRANSACTIONS55 ( 3 ) 477 - 481 2014年
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Chen C., Her J., Pan T., Chiu F., Koyama K. . Structural properties and electrical characteristics of high-k GdTiO<inf>3</inf> gate dielectrics for InGaZnO thin-film transistors . 2014 10th International Vacuum Electron Sources Conference, IVESC 2014 and 2nd International Conference on Emission Electronics, ICEE 2014 - Proceedings 2014年査読
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M. Mitsui, R.Y. Umetsu, M. Saito, K. Koyama, H. Kawarada . Synthesis and diffusion of MnBi in high magnetic fields . The International Symposium on Ecotopia Science 2013 and The 5th International Symposium on Advanced Materials Development and Integration of Novel Structural Metallic and Inorganic Materials (ISETS’13 and AMDI-4) 1317 2013年12月
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J. Goto, T. Kakimoto, S. Fujii and K. Koyama . Magnetic and electronic structures and Cobalt or Copper substituted Mn2Sb . Mater. Trans.54 ( 12 ) 2309 - 2312 2013年12月査読
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Andreev A.V., Tereshina E.A., Gorbunov D.I., Šantavá E., Šebek J., Žáček M., Homma Y., Shiokawa Y., Satoh I., Yamamura T., Komatsubara T., Watanabe K., Koyama K. . Magnetic Anisotropy in Intermetallic Compounds Containing Both Uranium and 3d-Metal1 . Physics of Metals and Metallography114 ( 9 ) 727 - 733 2013年9月
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Y. Mitsui, K. Oikawa, K. Koyama and K. Watanabe . Thermodynamic assessment for the Bi-Mn binary phase diagram in high magnetic fields . J. Alloys Comp.577 315 - 319 2013年8月査読
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Y. Mitsui, Y. Ikehara, K. Watanabe, E.S. Choi, E.C. Palm and K. Koyama . Thermal analysis on MnBi in high magnetic fields up to 45 T . J. Korean Phys. Soc.62 1769 - 1772 2013年8月査読
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Shimada D., Orihashi H., Mitsunaga D., Ito M., Hiroi M., Koyama K., Onodera R., Takahashi K., Matsubayashi K., Uwatoko Y. . Magnetic properties of Mn<inf>2</inf>Sb<inf>1-x</inf>Ge<inf>x</inf> (0.05 ≤ x ≤ 0.2) in high magnetic fields . Journal of the Korean Physical Society63 ( 3 ) 747 - 750 2013年8月査読
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R. Onodera, S. Kimura, K. Watanabe, Y. Yokoyama, A. Makino and K. Koyama . Isothermal Crystallization of Iron-Based Amorphous Alloys in a High Magnetic Field . Mater. Trans54 ( 7 ) 1232 - 1235 2013年7月査読
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A.V. Andreev, E.A. Tereshina, D.I. Gorbunov, E. Santava, J. Sebek, M. Zacek, Y. Homma, Y. Shiokawa, I. Satoh, t. Yamamura, T. Komatsubara, K. Watanabe and K. Koyama . Magnetic anisotropy in intermetallic compounds containing both Uranium and 3d-metal . Phys. Metals and Metallography114 727 - 733 2013年7月査読
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T. Shigeoka, T. Fujiwara, K. Koyama, S. Kimura and K. Watanabe . Multi-step metamagnetic processes of PrPd2Si2 single crystal . J. Korean Phys. Soc.63 567 - 570 2013年7月査読
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Y. Adachi, T. Kitai, K. Koyama, H. Yoshika, and T. Kaneko . Magnetization curves of TbZn2 in high magnetic fields . J. Korean Phys. Soc.62 2077 - 2079 2013年7月査読
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M. Hiroi, K. Uchida, I. Shigeta, M. Ito and K. Koyama . Antiferromagnetic transition in Ru2CrSi in magnetic fields . J. Korean Phys. Soc.62 2068 - 2072 2013年7月査読
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D. Shimada, H. Orihashi, D. Mitsunaga, M. Ito, M. Hiroi, K. Koyama, R. Onodera, K. Takahashi, K. Matsubayashi, Y. Uwatoko . Magnetic properties of Mn2Sb1-xGex (0.05 ? x ? 0.2) in high magnetic fields . J. Korean Phys. Soc.62 747 - 750 2013年7月査読
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X. Xu, T. Kihara, M. Tokunagam, A. Matsuo, W. Ito, R.Y. Umetsu, K. Koyama, R. Kainuma . Thermal transformation arrest phenomenon in the metamagnetic shape memory alloys . ICFSMA’13 The Fourth International Conference on Ferromagnetic Shape Memory Alloys, Conference Proceedings 26 - 27 2013年6月
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H. Orihashi, M. Hiroi, Y. Mitsui, K. Takahashi, K. Watanabe, K. Matsubayashi, Y. Uwatoko and K. Koyama, . Magnetic and Structural Properties of Mn1.8Co0.2Sb under High Magnetic Fields . Mater. Trans.54 ( 6 ) 969 - 973 2013年6月査読
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T. Sakon, K. Koyama, O. Kamiya, S. Awaji, S. Nakamura, T. Nojima, H. Nojiri, K. Watanabe, and M. Hiroi . High-field magnetization measurements of Fe2MnSi . J. Phys. Soc. Jpn.82 ( 4 ) 44802 - -4 2013年4月査読
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S. Kimura, K. Okunishi, M. Hagiwara, K. Kindo, Z. He, T. Taniyama, M. Itoh, K. Koyama, and K. Watanabe . Collapse of Magnetic Order of the Quasi One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8 in Transverse Fields . J. Phys. Soc. Jpn82 ( 3 ) 33706 - -4 2013年3月査読
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K. Koyama, K. Watanabe, O. Tegus, E. Bruck, K.H.J. Buschow, F.R. de Boer . X-Ray Powder Diffraction Studies on MnFeP0.78Ge0.22 in High Magnetic Fields . J. Low Temp. Phys.170 ( 42130 ) 279 - 284 2013年3月査読
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Y. Mitsui, K. Koyama and K. Watanabe . Bi-Mn Binary Phase Diagram in High Magnetic Fields . Mater. Trans.54 ( 2 ) 242 - 245 2013年2月査読
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R. Onodera, S. Kimura, K. Watanabe, S. Lee, Y. Yokoyama, A. Makino and K. Koyama . Magnetic Field Effects on Crystallization of Iron-Based Amorphous Alloys . Mater. Trans.54 ( 2 ) 188 - 191 2013年2月査読
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R.Y. Umetsu, D. Kikuchi, K. Koyama, K. Watanabe, Y. Yamaguchi, R. Kainuma, T. Kanomata . Site occupancy and magnetic moment of Fe in Ni2Mn0.3Fe0.7Ga alloy by neutron powder diffraction study . J. Alloy. Comp.580 ( 7 ) 506 - 511 2013年1月査読
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I. Shigeta, Y. Sakuraba, S. Kimura, K. Koyama, K. Watanabe, K. Takanashi, and M. Hiroi, . Transport and magnetic properties of fully-epitaxial superconducting NbN/half-metallic Heulser alloys Co2MnSi bilayer films . J. Magn. Soc. Jpn37 222 - 226 2013年1月査読
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Amitani H., Asakawa A., Ogiso K., Nakahara T., Ushikai M., Haruta I., Koyama K.I., Amitani M., Cheng K.c., Inui A. . The role of adiponectin multimers in anorexia nervosa . Nutrition29 ( 1 ) 203 - 206 2013年1月
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K. Watanabe, Y. Mitsui, K. Koyama . Heat-treatment processing for MnBi in high magnetic fields . Advances in Science and Technology78 19 - 24 2013年査読
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重田 出, 桜庭 裕弥, 木村 尚次郎, 小山 佳一, 渡辺 和雄, 高梨 弘穀, 廣井 政彦 . 26aKF-1 ハーフメタル型ホイスラー合金/超伝導体接合の輸送特性 III(スピントロニクス(スピン流),領域3(磁性,磁気共鳴)) . 日本物理学会講演概要集68.2.3 ( 0 ) 399 2013年
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Goto J., Kakimoto T., Fujii S., Koyama K. . Magnetic and electronic structures of cobalt or copper substituted mn . MATERIALS TRANSACTIONS54 ( 12 ) 2309 - 2312 2013年
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Orihashi H., Hiroi M., Mitsui Y., Takahashi K., Watanabe K., Matsubayashi K., Uwatoko Y., Koyama K. . Magnetic and Structural Properties of Mn₁.₈Co₀.₂Sb under High Magnetic Fields . MATERIALS TRANSACTIONS54 ( 6 ) 969 - 973 2013年
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西迫裕也, 大久保亮成, 春森浩平, 重田 出, 梅津理恵, 伊藤昌和, 小山佳一, 貝沼亮介, 廣井政彦 . アンドレーエフ反射法によるハーフメタル型ホイスラー合金Co2MnSiのスピン分極率測定 . 鹿児島大学理学部紀要46 1 - 8 2013年
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I. Shigeta, Y. Sakuraba, S. Kimura, K. Koyama, K. Watanabe, K. Takanashi, M. Hiroi . Transport and magnetic properties of fully-epitaxial superconducting NbN/half-metallic Heulser alloy Co2MnSi bilayer films . Transactions of the Magnetics Society of Japan37 ( 3-2 ) 222 - 226 2013年
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重田 出, 桜庭 裕弥, 木村 尚次郎, 小山 佳一, 渡辺 和雄, 高梨 弘毅, 廣井 政彦 . 27aXA-13 ハーフメタル型ホイスラー合金/超伝導体接合の輸送特性II(27aXA スピントロニクス(ナノ磁性体),領域3(磁性,磁気共鳴)) . 日本物理学会講演概要集68.1.3 ( 0 ) 537 2013年
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Mitsui Y., Koyama K., Watanabe K. . Bi–Mn Binary Phase Diagram in High Magnetic Fields . MATERIALS TRANSACTIONS54 ( 2 ) 242 - 245 2013年
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J.A. Monroe, I. Karaman, B. Basaran, W. Ito, R.Y. Umetsu, R. Kainuma, K. Koyama, Y.I. Chumlyakov . Direct measurement of large reversible magnetic-field-induced strain in Ni-Co-Mn-In metamagnetic shape memory alloys . Acta Materialia60 ( 20 ) 6883 - 6891 2012年12月査読
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Inomata T., Matsukawa M., Kimura D., Yamato Y., Kobayashi S., Suryanarayanan R., Nimori S., Koyama K., Takahashi K., Watanabe K., Kobayashi N. . Suppression of the low-temperature phase-separated state under pressure in (Eu <inf>1-x</inf>Gd <inf>x</inf>) <inf>0.6</inf>Sr <inf>0.4</inf>MnO <inf>3</inf> (x = 0, 0.1) . Journal of Magnetism and Magnetic Materials324 ( 22 ) 3863 - 3869 2012年11月査読
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K. Koyama, Y. Mitsui, E.S. Choi, Y. Ikehara, E. Palm, and K. Watanabe . Controlled Equilibrium State of Ferromagnetic MnBi by High Magnetic Fields . Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications, (Nagasaki, 2012) 110 - 113 2012年9月
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T. Inomata, M. Matsukawa, D. Kimura, Y. Yamato, S. Kobayashi, R. Suryanarayanan, S. Nimori, K. Koyama, K. Takahashi, K. Watanabe, N. Kobayashi . Suppression of the low-temperature phase-separated state under pressure in (Eu1-xGdx)0.6Sr0.4MnO3 (x= 0, 0.1) . J. Magn. Magn. Mater.324 3863 - 3869 2012年7月査読
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折橋広樹、満永大輔、廣井政彦、三井好古、高橋弘紀、渡辺和雄、小山佳一 . 強磁場 X 線回折実験による Mn1.8Co0.2Sb の 磁場中結晶評価 . 日本金属学会誌76 ( 4 ) 246 - 250 2012年4月査読
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S. Ebisu, K. Koyama, T. Horikoshi, M. Kokita, S. Nagata . Extremely broad hysteresis in the magnetization process of α-Dy <inf>2</inf>S<inf>3</inf> single crystal induced by high field cooling . Journal of Physics: Conference Series400 ( PART 3 ) 2012年
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折橋 広樹, 満永 大輔, 廣井 政彦, 三井 好古, 高橋 弘紀, 渡辺 和雄, 小山 佳一 . 強磁場 X 線回折実験による Mn<sub>1.8</sub>Co<sub>0.2</sub>Sb の磁場中結晶評価 . 日本金属学会誌76 ( 4 ) 246 - 250 2012年
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Y. Mitsui,K. Koyama,K. Takahashi, and Kazuo Watanabe . Development of an x-ray diffraction camera used in magnetic fields up to 10 T . Rev. Sci. Instrum.82 125104(1) - 125104(6) 2011年12月査読
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廣井政彦、小山佳一、伊藤昌和、重田 出 . ヘリウム液化装置 . 鹿児島大学理学部紀要44 27 - 32 2011年12月
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Ito M., Nagi Y., Kado N., Urakawa S., Ogawa T., Kondo A., Koyama K., Watanabe K., Kindo K. . Magnetic properties of spinel FeCr<inf>2</inf>S<inf>4</inf> in high magnetic field . Journal of Magnetism and Magnetic Materials323 ( 24 ) 3290 - 3293 2011年12月査読
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K. Oikawa, Y. Mitsui, K. Koyama, K. Anzai . Thermodynamic Assessment of the Bi-Mn System . MATERIALS TRANSACTIONS52 ( 11 ) 2032 - 2039 2011年11月査読
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M. Yamamoto, S. Sekida, T. Fukuda, T. Kakeshita, K. Takahashi,K. Koyama, H. Nojiri . A new type of FCT martensite phase in single-crystalline Fe(3)Pt Invar alloy . JOURNAL OF ALLOYS AND COMPOUNDS509 ( 34 ) 8530 - 8533 2011年8月査読
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Yamamoto M., Sekida S., Fukuda T., Kakeshita T., Takahashi K., Koyama K., Nojiri H. . A new type of FCT martensite phase in single-crystalline Fe<inf>3</inf>Pt Invar alloy . Journal of Alloys and Compounds509 ( 34 ) 8530 - 8533 2011年8月査読
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H. Kato,K. Koyama, K. Takahashi . Crystallization of Nd-Co-B nanocomposite ribbons in high magnetic fields . JOURNAL OF APPLIED PHYSICS109 ( 7 ) 07A726 2011年4月査読
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Y. Murano, M. Matsukawa, S. Ohuchi, S. Kobayashi, S. Nimori, R. Suryanarayanan, K. Koyama, N. Kobayashi . Effect of pressure on the magnetic, transport, and thermal-transport properties of the electron-doped manganite CaMn1-xSbxO3 . Phys. Rev. B 83 ( 5 ) 54437 - -13 2011年2月査読
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K. Koyama, Y. Mitsui, E.S. Choi, Y. Ikehara, E.C. Palm, K. Watanabe . Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields . J. Alloys. Comp.509 L78 - L80 2011年1月査読
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R.Y. Umetsu K. Ito, K. Koyama, T. Kanomata, K. Ishida and R. Kainuma, . Kinetic arrest behavior in martensitic transformation of NiCoMnSn metamagnetic shape memory alloy . J. Alloys and Comp.509 1389 - 1393 2011年1月査読
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M. Ito, Y. Nagi,N. Kado, S. Urakawa,T. Ogawa, A. Kondo,K. Koyama, K. Watanabe, K. Kindo . Magnetic properties of spinel FeCr(2)S(4) in high magnetic field . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS323 ( 24 ) 3290 - 3293 2011年査読
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Koshi Takenaka, Takashi Shibayama, Kazuko Asano, Keiichi Koyama . Magnetostructural Correlations in Nitrogen-Deficient Antiperovskite Mn3CuN1-delta . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN79 ( 7 ) 2010年7月査読
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H Nishihara, Y Furutani, T Wada, T Kanomata, K Kobayashi, R Kainuma, K Ishida, K Koyama, K Watanabe . Hyperfine coupling constant for 59Co estimated from a high-field susceptibility and high-field NMR shift in ferromagnetic Co2TiGa and Co2VGa . J. Phys. Conf. Ser.200 32052 2010年1月査読
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K. Takenaka, T. Shibayama, K. Asano and K. Koyama . Magnetostructural Correlations in Nitrogen-Deficient Antiperovskite Mn3CuN1-δ . J. Phys. Soc. Jpn.79 73706 2010年査読
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Y.Mitsui, K. Koyama, W. Ito, R.Y. Umetsu, R. Kainuma, K. Watanabe . Observation of Reverse Transformation in Metamagnetic Shape Memory Alloy Ni40Co10Mn34Al16 by High-Field X-Ray Diffraction Measurements . Materials Transactions51 1648 - 1650 2010年査読
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M. Fukuhara, H. Yoshida, K. Koyama, A. Inoue, Y. Miura . Superconductivity of Ni-Nb-Zr-H Glassy Alloys with Nanoclusters . J. Nanosci. Nanotech.10 4975 - 4978 2010年査読
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K. Watanabe, S. Awaji, K. Koyama, G. Nishijima, K. Takahashi K, and Y. Sasaki . Tohoku High Magnetic Field Research Activities Using Cryogen-Free Superconducting Magnets . J. Low Temp. Phys.159 370 - 373 2010年査読
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M. Fukuhara, H. Yoshida, K. Koyama, A. Inoue, and Y. Miura . Electronic transport behaviors of Ni-Nb-Zr-H glassy alloys . J. Appl. Phys.107 33703 2010年査読
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T. Shigeoka, T. Fujiwara, K. Koyama, K. Watanabe, and Y. Uwatoko . High Field Metamagnetism of PrRh2Si2 Single Crystal Compound Having Anomalously High NSel Temperature . J. Low Temp. Phys.159 42 - 45 2010年査読
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A.V. Andreev, E.A. Tereshina, E. Santava, J. Sebek, K. Koyama, and K. Watanabe . Sublattice contributions to the magnetism of UFe5Al7 and UFe6Al6 . J. Alloys Comp. 492 52 - 55 2010年査読
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X. Xu, W. Ito, R.Y. Umetsu, K. Koyama, R. Kainuma, and K. Ishida . Kinetic Arrest of Martensitic Transformation in Ni33.0Co13.4Mn39.7Ga13.9 Metamagnetic Shape Memory Alloy . Mater. Trans.51 469 - 471 2010年査読
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P.J. Shamberger, A.B. Pakhomov, K. Koyama, F.S. Ohuchi . Deviation of the magnetization change from the structural phase transition temperature in polycrystalline Ni-Mn-Sn in low magnetic fields . Scripta Materialia63 1161 - 1164 2010年査読
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M. Fukuhara, H. Yoshida, K. Koyama, A. Inoue . Magnetic-field-induced Coulomb oscillation in Ni-Nb-Zr-H glassy alloys . Physica B405 3791 - 3794 2010年査読
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M. Yamamoto, T. Fukuda, T. Kakeshita, K. Koyama, H. Nojiri . Martensitic transformation in invar Fe3Pt with highly ordered state . Physics Procedia10 117 - 119 2010年査読
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Hiroi M., Rokkaku T., Matsuda K., Hisamatsu T., Shigeta I., Ito M., Sakon T., Koyama K., Watanabe K., Nakamura S., Nojima T., Nakano T., Chen L., Fujiwara T., Uwatoko Y., Manaka H., Terada N. . Ferromagnetism and spin-glass transitions in the Heusler compounds Ru2-x Fex CrSi . Physical Review B Condensed Matter and Materials Physics79 ( 22 ) 2009年6月査読
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A. V. Andreev, K. Koyama, E. A. Tereshina, J. Prokleska, K. Watanabe . Magnetoelasticity of (Lu(0.8)Ce(0.2))(2)Fe(17) intermetallic compound . JOURNAL OF ALLOYS AND COMPOUNDS477 ( 1-2 ) 62 - 67 2009年5月査読
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H. C. Hsu, F. C. Chou, K. Koyama, K. Watanabe, H. L. Liu . Spin-phonon coupling in antiferromagnetic Bi2 Sr2 CoO6+δ: An infrared reflectance study . Physical Review B - Condensed Matter and Materials Physics79 ( 15 ) 2009年4月査読
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Y. Yamato, M. Matsukawa, Y. Murano, R. Suryanarayanan, S. Nimori, M. Apostu, A. Revcolevschi, K. Koyama, N. Kobayashi . Colossal electroresistance and colossal magnetoresistive step in paramagnetic insulating phase of single crystalline bilayered manganite (La0.4Pr0.6)(1.2)Sr1.8Mn2O7 . APPLIED PHYSICS LETTERS94 ( 9 ) 2009年3月査読
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Yoshifuru Mitsui, Keiichi Koyama, Kazuo Watanabe . X-ray diffraction measurements in high magnetic fields and at high temperatures . SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS10 ( 1 ) 2009年3月査読
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Y. Furutani, H. Nishihara, T. Kanomata, K. Kobayashi, R. Kainuma, K. Ishida, K. Koyama, K. Watanabe, T. Goto . Field-induced-moment nuclear coupling for 59Co in a Heusler alloy Co2TiGa . J. Phys.. Conf. Ser.150 42037 - -4 2009年1月査読
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Yoshifuru Mitsui, Keiichi Koyama, Yuko Nakamori, Shin-ichi Orimo, Kazuo Watanabe . Magnetic and Structural Phase Transitions in Ferromagnetic MnBi . JOURNAL OF THE JAPAN INSTITUTE OF METALS73 ( 1 ) 40 - 45 2009年1月査読
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R.Y. Umetsu, W. Ito, K. Ito, K. Koyama, A. Fujita, K. Oikawa, T. Kanomata, R. Kainuma, K. Ishida . Anomaly in entropy change between parent and martensite phases in the Ni50Mn34In16 Heusler alloy . Scripta Materialia60 25 - 28 2009年査読
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三井好古、小山佳一、中森裕子、折茂慎一、渡辺和雄 . 強磁場下における強磁性体MnBiの相転移 . 日本金属学会誌73 40 - 45 2009年査読
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三井好古、小山佳一、渡辺和雄 . 強磁場・高温X線回折測定用試料電気炉の性能評価 . J. Magn. Soc. Jpn.33 60 - 63 2009年査読
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K. Koyama, Y. Mitsui, K. Tahashi and K. Watanabe . X-ray powder diffraction camera for high-field experiments . J. Phys.: Conf. Ser.156 12018 2009年査読
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K. Koyama, R. Sakakura and K. Watanabe . Development of an extraction type magnetometer under low temperature and high magnetic fields over 20 T by the hybrid magnet . J. Phys.: Conf. Ser.156 12019 2009年査読
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Y. Mitsui, K. Koyama and K. Watanabe . X-ray diffraction measurements in high magnetic field and at high temperatures . Sci. Technol. Adv. Mater.10 14612 2009年査読
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T. Akiya, H. Kato, M. Sagawa and K. Koyama . Enhancement of coercivity in Al and Cu added Nd-Fe-B sintered magnets by high field annealing . IOP Conf. Ser.: Mat. Sci. Eng.1 12034 2009年査読
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Y. Yamato, M. Matsukawa, Y. Murano, R. Suryanarayanan, S. Nimori, M. Apostu, A. Revcolevschi, K. Koyama, N. Kobayashi . Colossal electroresistance and colossal magnetoresistive step in paramagnetic insulating phase of single crystalline bilayered manganite (La0.4Pr0.6)1.2Sr1.8Mn2O7 . Appl. Phys. Lett.94 92507 2009年査読
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Y. Yamato, M. Matsukawa, S. Nimori, R. Suryanarayanan, Y. Murano, Y. Nakanishi, M. Apostu, A. Revcolevschi, K. Koyama, and N. Kobayashi . Effect of pressure on Lattice distortion, transport and magnetic properties of Pr-substituted La1.2Sr1.8Mn2O7 bilayered manganite . J. Phys.: Condens Matter21 486001 2009年査読
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H.C. Hsu, F.C. Chou, K. Koyama, K. Watanabe and H.L. Liu . Spin-phonon coupling in antiferromagnetic Bi2Sr2CoO6+δ: An intrared reflectance study . Phys. Rev. B79 155109 2009年査読
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M. Hiroi M, T. Rokkaku, K. Matsuda, T. Hisamatsu, I. Shigeta, M. Ito, T. Sakon, K. Koyama, K. Watanabe, S. Nakamura, T. Nojima, T. Nakano, L. Chen, T. Fujiwara, Y. Uwatoko, H. Manaka, and N. Terada . Ferromagnetism and spin-glass transitions in the Heusler compounds Ru2-xFexCrS . Phys. Rev. B79 224423 2009年査読
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A.V. Andreev, K. Koyama, E.A. Tereshina, J. Prokleska, and K. Watanabe . Magnetoelasticity of (Lu0.8Ce0.2)2Fe17 intermetallic compound . J. Alloys and Compounds477 62 - 67 2009年査読
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T Kawamata, N Sugawara, M Uesaka, N Kaneko, T Kajiwara, H Yamane, K Koyama, K Kudo, N Kobayashi, Y Koike . Single-Crystal Growth of Pb2V3O9 and the Bose-Einstein Condensed State of Triplons Studied by Thermal Conductivity, Specific Heat and Magnetization Measurements . J. Phys.: Conf. Ser.150 42087 2009年査読
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Y. Yamato, Y. Nakanishi, M. Matsukawa, R. Suryanarayanan, S. Nimori, M. Apostu, A. Revcolevschi, K. Koyama, N. Kobayashi . Anomalous pressure effect on steplike magnetostriction of (La0.4Pr0.6)(1.2) Sr1.8Mn2O7 bilayered manganese oxide . 25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4150 2009年
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S. Ebisu, K. Koyama, H. Omote, S. Nagata . High field magnetization processes in single crystals of α-Tb <inf>2</inf>S<inf>3</inf> and α-Dy<inf>2</inf>S<inf>3</inf> . Journal of Physics: Conference Series150 2009年査読
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Y. Furutani, H. Nishihara, T. Kanomata, K. Kobayashi, R. Kainuma, K. Ishida, K. Koyama, K. Watanabe, T. Goto . Field-induced-moment nuclear Coupling for Co-59 in a Heusler alloy Co2TiGa . 25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4150 2009年
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H. Okada, Y. Kusakari, E. Matsuoka, H. Onodera, K. Koyama, K. Watanabe, T. Kanomata . Transport properties of Heusler compounds Ru2CrGe and Ru2CrSn under high magnetic fields . 25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4150 2009年
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E. G. Gerasimov, N. V. Mushnikov, K. Koyama, T. Kanomata, K. Watanabe . Positive magnetoresistance and large magnetostriction at first-order antiferro-ferromagnetic phase transitions in RMn(2)Si(2) compounds . JOURNAL OF PHYSICS-CONDENSED MATTER20 ( 44 ) 2008年11月査読
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Y. Yamato, M. Matsukawa, T. Kumagai, R. Suryanarayanan, S. Nimori, M. Apostu, A. Revcolevschi, K. Koyama, N. Kobayashi . Effect of pressure on the steplike magnetostriction of single crystalline bilayered manganite (La(0.4)Pr(0.6))(1.2)Sr(1.8)Mn(2)O(7) . PHYSICAL REVIEW B78 ( 13 ) 2008年10月査読
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T. Fujita, H. Okada, K. Koyama, K. Watanabe, S. Maekawa, M. W. Chen . Unusually Small Electrical Resistance of Three-Dimensional Nanoporous Gold in External Magnetic Fields . PHYSICAL REVIEW LETTERS101 ( 16 ) 2008年10月査読
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Hiroaki Kato, Takahiro Akiya, Kunihiro Koike, Keiichi Koyama, Masato Sagawa . Coercivity enhancement induced by high-magnetic-field annealing in sintered Nd-Fe-B magnets . Proceedings of The 20th Workshop on Rare Earth Permanent Magnets and Applications 2008年9月招待
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A. V. Andreev, E. A. Tereshina, E. Santava, I. Satoh, T. Yamamura, Y. Shiokawa, K. Koyama, K. Watanabe . Magnetic properties of U-2(Fe1-xNix)(13.6)Si-3.4 single crystals . JOURNAL OF ALLOYS AND COMPOUNDS461 ( 1-2 ) 6 - 8 2008年8月
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M. Ohtsuka, J. Sekino, K. Koyama, T. Takagi, K. Itagaki . Magnetostructural phase transformation and shape memory effect of Fe-added Ni(2)MnGa films . EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS158 173 - 178 2008年5月査読
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K. Koyama, H. Onodera, and K. Watanabe . Magnetization measurements of DyB2C2 under high pressure and high magnetic fields . Physica B403 1607 - 1608 2008年査読
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E.G. Gerasimov, N.V. Nushnikov, K. Koyama, T. Kanomata, and K. Watanabe . Positive magnetoresistance and large magnetostriction at first-order antiferro-ferromagnetic phase transitions in RMn2Si2 compounds . J. Phys.: Condens. Matter20 445219 2008年査読
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A.V. Andreev, E.A. Tereshina, E. Santava, I. Satoh, T. Yamamura, Y. Shiokawa, K. Koyama, K. Watanabe . Magnetic properties of U2(Fe1-xNix)13.6Si3.4 single crystals . J. Alloys Comp.461 6 - 8 2008年査読
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Y. Takahashi, T. Harada, T. Kanomata, K. Koyama, H. Yoshida, T. Kaneko, M. Kataoka . Magnetoresistance effect of pseudobinary compounds Cr1-xRuxSb2 . J. Alloys Comp.459 78 - 82 2008年査読
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A.V. Andreev, E.A. Tereshina, E. Santava, K. Koyama, Y. Homma, I. Satoh, T. Yamamura, Y. Shiokawa, K. Watanabe . Magnetic properties of U2Co17-xSix single crystals . J. Alloys Comp.450 51 - 57 2008年査読
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T. Sakon, S. Saito, K. Koyama, S. Awaji, I. Sato, T. Nojima, K. Watanabe, M. Motokawa, N.K. Sato . Magnetic anisotropy study of UGe2 in a static high magnetic field . J. Phys.: Conf. Ser. 51 255 - 258 2008年査読
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T. Shigeoka, N. Kimura, K. Koyama and K. Watanabe . High field magnetization of TbCu2Si2 single crystal compound . J. Phys.: Conf. Ser51 83 - 86 2008年査読
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Y. Makihara, H. Fujii, T. Fujiwara, K. Watanabe, K. Takahashi, K. Koyama and M. Motokawa . Magneto-volume effect in the ground and field induced states of Ce2Fe17 . Physica B329-333 663 - 664 2008年査読
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T. Fujiwara, H. Fujii, Y. Uwatoko, K. Koyama, M. Motokawa and T. Shigeoka . Dramatic change of the magnetic characteristics in YbMn2Ge2 under high pressures . Acta Phys. Pol. B (Sp. Iss.)34 1541 - 1544 2008年査読
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K. Koyama, T. Goto, T. Kanomata, R. Note and Y. Takahashi . Nonlinear magnetization process of single-crystalline FeSi . J. Phys. Soc. Jpn.69 219 - 224 2008年査読
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H. Okada, K. Koyama, M. Nakatake, K. Shimada, H. Namatame, M. Taniguchi, and K. Watanabe . Photoemission spectroscopy of spinel-type CuV2S4 single crystal . J. Phys. Soc. Jpn77 114711 2008年査読
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H. Okada, K. Koyama, M. Hedo, Y. Uwatoko, and K. Watanabe . Pressure-induced metal-insulator transition in spinel compound CuV2S4 . Phsica B403 1612 - 1613 2008年査読
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Y. Yamato M. Matsukawa, T. Kumagai, R. Suryanarayanan, S. Nimori, M. Apostu, A. Revcolevschi, K. Koyama, and N. Kobayashi . Effect of pressure on the steplike magnetostriction of single crystalline bilayered manganite (La0.4Pr0.6)1.2Sr1.8Mn2O7 . Phys. Rev. B78 132411 2008年査読
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W. Ito, K. Ito, R.Y. Umetsu, R. Kainuma, K. Koyama, K. Watanabe, A. Fujita, K. Oikawa, K. Ishida, T. Kanomata . Kinetic arrest of martensitic transformation in the NiCoMnIn metamagnetic shape memory alloy . Appl. Phys. Lett.92 21908 2008年査読
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K. Takahashi, K. Koyama, and K. Watanabe . 100 mm wide bore cryocooled hybrid magnet for a high field X-ray diffractometer . IEEE trans. Apply. Superconductivity18 536 - 539 2008年査読
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T. Fujita, H. Okada, K. Koyama, K. Watanabe, S. Maekawa and M.W. Chen . Unusual Small Electrical Resistance of Three-Dimensional Nanoporous Gold in External Magnetic Fields . Phys. Rev. Lett.101 166601 2008年査読
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K. Koyama, Y. Mitsui and K. Watanabe . Magnetic and structural phase transitions of MnBi under high magnetic fields . Sci. Technol. Adv. Mater.9 24204 2008年査読
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M. Ohtsuka, J. Sekino, K. Koyama, T. Takagi, and K. Itagaki . Magnetostructural phase transformation and shape memory effect of Fe-added Ni2MnGa films . Eur. Phys. J. Special Topics158 173 - 178 2008年査読
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K. Asano, K. Koyama, and K. Takenaka . Magnetostriction in Mn3CuN . Appl. Phys. Lett.92 161909 2008年査読
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H. Okada, K. Koyama, K. Watanabe, Y. Kusakari, T. Kanomata, and H. Nishihara . Magnetic properties of Heusler compounds Ru2CrGe and Ru2CrSn . Appl. Phys. Lett. 92 62502 2008年査読
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E.A. Tereshina, A.V. Andreev, K. Koyama, K. Watanabe . Magnetostriction at the Metamagnetic Phase Transition in (Lu0.8Ce0.2)2Fe17 . WDS’08 Proceedings of Contributed papers, Part III, 101 - 106 2008年
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Makoto Yoshida, Yumiko Kitano, Yuji Inagaki, Takahiro Sakurai, Motoi Kimata, Susumu Okubo, Hitoshi Ohta, Keiichi Koyama, Mitsuhiro Motokawa, Takayuki Asano, Yoshitami Ajiro . Observation of direct transitions in the ferromagnetic and antiferromagnetic dimer system (CH3)(2)NH2CUCl3 by high-field ESR . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN76 ( 11 ) 2007年11月査読
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K. Hachitani, H. Amanuma, H. Fukazawa, Y. Kohori, I. Watanabe, K. Koyama, K. Kumagai, C. Sekine, I. Shirotani . Sm-based Filled Skutterudite Phosphides SmT<inf>4</inf> P<inf>12</inf> (T = Fe, Ru, Os) Studied by <sup>31</sup>P-NMR and μSR . Journal of Physics and Chemistry of Solids68 ( 11 ) 2080 - 2083 2007年11月
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E. A. Tereshina, A. V. Andreev, K. Koyama, Y. Shiokawa, I. Satoh, K. Watanabe . Magnetic anisotropy and spin reorientation in U2Co15Si2 . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS316 ( 2 ) E515 - E518 2007年9月査読
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A. V. Andreev, K. Koyama, N. V. Mushnikov, V. Sechovsky, Y. Shiokawa, I. Satoh, K. Watanabe . Interplay between effects of external pressure and dilution of the U sublattice in UCoAl-based materials . JOURNAL OF ALLOYS AND COMPOUNDS441 ( 1-2 ) 33 - 38 2007年8月査読
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Tetsuya Onogi, Keiichi Koyama, Kazuo Watanabe . Magnetic properties of MnBi in high magnetic fields and high temperature . JOURNAL OF THE JAPAN INSTITUTE OF METALS71 ( 6 ) 489 - 493 2007年6月査読
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M. Matsukawa, Y. Yamato, T. Kumagai, A. Tamura, R. Suryanarayanan, S. Nimori, M. Apostu, A. Revcolevschi, K. Koyama, N. Kobayashi . Steplike lattice deformation of single crystalline (La0.4Pr0.6)(1.2)Sr1.8Mn2O7 bilayered manganite . PHYSICAL REVIEW LETTERS98 ( 26 ) 2007年6月
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T. Sakon, S. Saito, K. Koyama, S. Awaji, I. Sato, T. Nojima, K. Watanabe, N. K. Sato . Experimental investigation of giant magnetocrystalline anisotropy of UGe2 . PHYSICA SCRIPTA75 ( 4 ) 546 - 550 2007年4月
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S. V. Demishev, A. V. Semeno, A. A. Pronin, N. E. Sluchanko, N. A. Samarin, H. Ohta, S. Okubo, M. Kimata, K. Koyama, M. Motokawa, A. V. Kuznetsov . Quantum criticality and collective effects in low-dimensional magnet CuGeO3 : Fe probed by high frequency EPR . JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM20 ( 2 ) 105 - 108 2007年2月
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M. Yoshida, Y. Kitano, Y. Inagaki, T. Sakurai, M. Kimata, S. Okubo, H. Ohta, K. Koyama, M. Motokawa, T. Asano, and Y. Ajiro . Observation of direct transitions in the ferromagnetic and antiferromagnetic dimmer system (CH3)2NH2CuCl3 by high-field ESR . J. Phys. Soc. Jpn76 113704 2007年1月査読
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M. Matsukawa, A. Tamura, S. Nimori, R. Suryanarayanan, T. Kumagai, Y. Nakanishi, M. Apostu, A. Revcolevschi, K. Koyama, N. Kobayashi . Anomalous pressure effect on the remanent lattice striction of a (La,Pr)(1.2)Sr1.8Mn2O7 bilayered manganite single crystal . PHYSICAL REVIEW B75 ( 1 ) 2007年1月
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Evgeniya A. Tereshina, Hajime Yoshida, Alexander V. Andreev, Irina S. Tereshina, Keiichi Koyama, Takeshi Kanomata . Magnetism of a Lu<inf>2</inf>Fe<inf>17</inf>H single crystal under pressure . Journal of the Physical Society of Japan76 82 - 83 2007年1月査読
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M. Kimata, Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H. M. Yamamoto, R. Kato . Low-temperature Fermi surface of the organic conductor β″ -(BEDT-TTF) (TCNQ)(1-x) (F1-TCNQ)x (x=0,0.05) from magnetooptical measurements . Physical Review B - Condensed Matter and Materials Physics75 ( 4 ) 2007年1月
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Alexander V. Andreev, Keiichi Koyama, Nikolai V. Mushnikov, Vladimir Sechovsky, Yoshinobu Shiokawa, Isamu Satoh, Kazuo Watanabe . Transition from ferromagnetism to metamagnetism under pressure in a uo.94yo.o6coal single crystal . Journal of the Physical Society of Japan76 43 - 46 2007年1月査読
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K. Koyama, S. Miura, H. Okada, T. Shigeoka, K. Watanabe . Magnetic entropy changes of SmMn2Ge2 under high pressure . Mater. Trans.48 451 - 454 2007年査読
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K. Hachitani, H. Amanuma, H. Fukazawa, Y. Kohori I. Watanabe, K. Koyama, K. Kumagai, C. Sekine and I. Shirotani . Sm-based filled Skutterudite phosphides SmT4P12 (T=Fe, Ru, Os) studied by 31P-NMR and μSR . J. Phys. Chem. Solid68 2080 - 2083 2007年査読
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M. Matsukawa, Y. Yamato, T. Kumagai, A. Tamura, R. Suryanarayanan, S. Nimori, M. Apostu, A. Recolevschi, K. Koyama, and N. Kobayashi . Steplike lattice deformation of single crystalline (La0.4Pr0.6)1.2Sr1.8Mn2O7 bilayered Manganite . Phys. Rev. Lett.98 267204 2007年査読
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E.A. Tereshina, A.V. Andreev, K. Koyama, Y. Shiokawa, I. Satoh, and K. Watanabe . Magnetic anisotropy and spin reorientation U2Co15Si2 . J. Magn. Magn. Mater316 e515 - e518 2007年査読
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A.V. Andreev, E.A. Tereshina, E. Santava, K. Koyama, Y. Homma, I. Satoh, T. Yamamura, Y. Shiokawa, K. Watanabe . Crystal structure and magnetic properties of U2Co17-xSix single crystals . J. Magn. Magn. Mater.310 e598 - e600 2007年査読
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A. Himori, M. Tanaka, K. Koyama, K. Watanabe and T. Shigeoka . Magnetic behavior of TbRh2Si2 single crystal . J. Magn. Magn. Mater.310 1770 - 1772 2007年査読
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T. Sakon, S. Saito, K. Koyama, S. Awaji, I. Sato, T. Nojima, K. Watanabe and N.K. Sato . Experimental investigation of giant magnetocrystaline anisotropy of UGe2 . Phys. Scr.75 546 - 550 2007年査読
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M. Matsukawa, A. Tamura, S. Nimmori, R. Suryanarayanan, T. Kumagai, Y. Nakanishi, M. Apostu, A. Revcolevschi, K. Koyama, and N. Kobayashi . Anomalous pressure effect on the remanent lattice striction of a (La, Pr)1.2Sr1.8Mn2O7 bilayered manganite single crystal . Phys. Rev. B75 14427 2007年査読
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A.V. Andreev, K. Koyama, N.M. Mushnikov, V. Sechovsky, Y. Shiokawa, I. Satoh, and K. Watanabe . Interplay between effects of external pressure and dilution of the U-sublattice in UCoAl-base materials . J. Alloys Comp.441 33 - 38 2007年査読
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O. Tegus, K. Koyama, J.L. Her, K. Watanabe, E. Bruck, K.H.J. Buschow, F.R. de Boer . X-ray diffraction on MnFeP0.46As0.54 in a magnetic field . Physica B392 151 - 153 2007年査読
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K. Wang, T. Fujita, M.W. Chen, T.G. Nieh, H. Okada, K. Koyama, W. Zhang and A. Inoue . Electrical conductivity of a bulk metallic glass composite . Appl. Phys. Lett.91 154101 2007年査読
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H. Kato, T. Akiya, M. Sagawa, K. Koyama and T. Miyazaki . Effect of high magnetic field on the coercivity in sintered Nd-Fe-B magnets . J. Magn. Magn. Matter.310 2596 - 2598 2007年査読
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K. Koyama, T. Onogi, Y. Mitsui, Y. Nakamoi, S. Orimo, and K. Watanabe . Magnetic phase transition of MnBi under high magnetic fields and high temperature . Mater. Trans.48 2414 - 2418 2007年査読
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小野木哲也、小山佳一、渡辺和雄 . 一次相転移物質MnBi の高温・強磁場磁気特性 . 日本金属学会誌71 489 - 493 2007年査読
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K. Koyama, T. Iagarashi, H. Okada, K. Watanabe, T. Kanomata, R. Kainuma, W. Ito, K. Oikawa, K. Ishida . Magnetic and thermoelectric properties of Ni50Mn36Sn14 in high magnetic fields . J. Magn. Magn. Mater.310 e994 - e995 2007年査読
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M. Kimata, Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H.M. Yamamoto, and R. Kato . Low-temperature Fermi surface of the organic conductor β”-(BEDT-TTF)(TCNQ)(1-x)(F1-TCNQ)x (x=0, 0.05) from magnetooptical measurements . Phys. Rev. B75 45126 2007年査読
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Kenichi Hachitani, Hideaki Amanuma, Hideto Fukazawa, Yoh Kohori, Keiichi Koyama, Ken-ichi Kumagai, Chihiro Sekine, Ichimin Shirotani . Appearance of successive phase transition in SmRU4P12 under high magnetic fields probed by P-31 nuclear magnetic resonance . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN75 ( 12 ) 2006年12月査読
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J Prchal, H Kitazawa, T Furubayashi, P Javorsky, K Koyama, Sechovsky, V . Low-temperature structural study of the TbPd1-xNixAl series . PHYSICA B-CONDENSED MATTER378-80 1102 - 1104 2006年5月
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K Yagasaki, S Notsu, Y Takaesu, T Nakama, E Sakai, K Koyama, K Watanabe, AT Burkov . X-Ray diffraction on rare earth-3d Laves phase compound ErCo2 in magnetic field . PHYSICA B-CONDENSED MATTER378-80 1089 - 1090 2006年5月
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Kazuo Watanabe, Asaya Fujita, Keiichi Koyama . Special issue on Research on New Magnetic Properties and Applications to Materials Science in Itinerant-Electron Systems - Preface . MATERIALS TRANSACTIONS47 ( 3 ) 455 - 455 2006年3月査読
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M. Kimata, Y. Oshima, K. Koyama, H. Ohta, M. Motokawa, H. Nishikawa, K. Kikuchi, I. Ikemoto . Detailed fermi surface topology of the quasi-one-dimensional conductor (DMET)(2)I-3 . JOURNAL OF LOW TEMPERATURE PHYSICS142 ( 3-4 ) 523 - 526 2006年2月
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H Okada, K Koyama, M Yamada, T Goto, Y Makihara, H Fujii, K Watanabe . Magnetic properties of Ce(Fe1-xCox)(2) under high pressure . JOURNAL OF ALLOYS AND COMPOUNDS408 144 - 146 2006年2月
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H. Kato, H. Kubota, K. Koyama, T. Miyazaki . Fabrication of SmFe<inf>12</inf>/α-Fe thin films as anisotropic nanocomposite magnet . Journal of Alloys and Compounds408 1368 - 1372 2006年2月
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H. Okada, K. Koyama, M. Yamada, T. Goto, Y. Makihara, H. Fujii, K. Watanabe . Magnetic properties of Ce(Fe1-xCox)2 under high pressure . J. Alloys Comp. 408-412 144 - 146 2006年査読
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K. Hachitani, H. Amanuma, H. Fukazawa, Y. Kohori, K. Koyama, KI, Kumagai, C. Sekine, I. Shirotani . Appearance of successive phase transition in SmRu4P12 under high magnetic fields probed by 31P nuclear magnetic resonance . J. Phsy. Soc. Jpn75 124712 2006年査読
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Y. Adachi, K. Izaki, T. Kitai, H. Yoshida, K. Koyama, H. Morita, H. Onodera, T. Kawae and T. Kaneko . Field-induced transitions in single crystals of TbCu4Ag and GdCu4Ag . J. Phys.: Conf. Ser.51 55 - 58 2006年査読
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T. Hori, K. Koyama, H. Shiraishi and K. Watanabe . Magnetic properties of NdxEr1-xMn6Sn6 alloys . J. Phys.: Conf. Ser.51 47 - 50 2006年査読
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T. Hori, H. Shiraishi, K. Ohoyama, M. Nishi, K. Koyama and K. Watanabe . Magnetic structure of Y1-xNdxMn6Sn6 alloys . Physica B385-386 320 - 322 2006年査読
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H. Nishihara, T. Kanomata, Y. Furutani, T. Igarashi, K. Koyama and T. Goto . NMR properties of half-Heusler CoVSb . Phys. Stat. Sol. (c)3 2779 - 2782 2006年査読
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D.X. Li, T. Yamamura, S. Nimori, K. Koyama and Y. Shiokawa . Magnetic properties of rare-earth compounds GdPdIn and TmPdIn . J. Alloys. Comp.418 151 - 154 2006年査読
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T. Kanomata, T. Igarashi, H. Nishihara, K. Koyama, K. Watanabe, K.U. Neumann, K.R.Z. Ziebeck . Magnetic properties of weak itinerant electron ferromagnet CoVSb . Mater. Trans.47 496 - 500 2006年査読
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J. Prchal, H. Kitazawa, T. Furubayashi, P. Javorsky and K. Koyama . Low-temperature structural study of the TbPd1-xNix series . Physica B378-380 1102 - 1104 2006年査読
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D.X. Li, S. Nimori, Y.X. Li, K. Koyama and Y. Shiokawa . Magnetic ordering in ternary germanide Nd2CuGe6 . J. Alloys. Comp.408-412 122 - 126 2006年査読
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K. Koyama, S. Miura, H. Okada, T. Shigeoka, S. Fujieda, A. Fujita, K. Fukamichi and K. Watanabe, . Magnetocaloric and structural properties of SmMn2Ge2 . J. Alloys. Comp. 408-412 118 - 121 2006年査読
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H. Okada, K. Koyama, and K. Watanabe . Specific heat measurement of the spinel compound CuV2S . the AIP Conference Proceedings850 1317 - 1318 2006年査読
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A. Himori, S. Ohishi, K. Koyama, K. Watanabe, and T. Shigeoka . Mulitstep metamagnetism of NdRh2Ge2 single crystal . J. Phys.: Conf. Ser.51 63 - 66 2006年査読
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E.A. Tereshina, H. Yoshida, A.V. Andreev, I.S. Tereshina, K. Koyama, and T. Kanomata . Interplay between hydrogenation and pressure effects in magnetism of Lu2Fe17 single crystal . High Pressure Res.26 485 - 488 2006年査読
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A.V. Andreev, K. Koyama, N.M. Mushnikov, V. Sechovsky, Y. Shiokawa, I. Satoh, and K. Watanabe . Interplay between effects of external pressure and dilution of the U sublattice in UCoAl-base materials: the U0.94Y0.06CoAl case . High Pressure Res.26 475 - 478 2006年査読
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K. Koyama, F. Ishikawa, and K. Watanabe . High field x-ray diffraction studies on magnetic refrigerants . Int. J Appl. Electromagnetics and Mechanics23 153 - 163 2006年査読
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K. Watanabe, G. Nishijima, S. Awaji, K. Koyama, K. Takahashi, N. Kobayashi and T. Kiyoshi . Cryocooled superconducting magnets for high magnetic fields at the HFLSM and future collaboration with the TML . J. Phys.: Conf. Ser.51 631 - 634 2006年査読
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K. Koyama, S. Miura, H. Okada, and K. Watanabe . Development of an extraction type magnetometer under high pressure and high magnetic fields over 200 kOe in the hybrid magnet . J. Phys.: Conf. Ser.51 569 - 572 2006年査読
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K. Takahashi, S. Awaji, Y. Sasaki, K. Koyama and K. Watanabe . Design of an 8 MW water-cooled magnet for a 35 T hybrid magnet at the HFLSM . IEEE Trans. Appl. Supercond.16 977 - 980 2006年査読
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T. Ito, M. Ishizuka, T. Tsurudome, H. Ookubo, J. Sakuraba, S. Awaji, G. Nishijima, K. Koyama, K. Takahashi and K. Watanabe . Development of a 10 T cryocooled superconducting magnet with a room temperature bore of 360 mm for a 29 T hybrid magnet . Adv. Cryo. Eng.51 1743 - 1748 2006年査読
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高橋弘紀、淡路智、佐々木嘉信、小山佳一、渡辺和雄 . 小型冷凍機冷却34T-8MWハイブリッドマグネットへの発展と磁気科学応用 . 低温工学41 316 - 321 2006年査読
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K. Watanabe, G. Nishijima, S. Awaji, K. Takahashi, K. Koyama, N. Kobayashi, M. Ishizuka, T. Itou, T. Tsurudome and J. Sakuraba . Performance of a cryogen-free 30 T-class hybrid magnet . IEEE trans. Appl. Superc.16 934 - 939 2006年査読
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秋屋貴博、加藤宏明、佐川眞人、小山佳一、宮崎照宣 . Nd-Dy-Fe-B系焼結磁石の強磁場中熱処理と保磁力 . J. Magn. Soc. Jpn.30 447 - 454 2006年査読
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H. Kato, H. Kubota, K. Koyama and T. Miyazaki . Fabrication of SmFe12/α-Fe thin films as anisotropic nanocomposite magnet . J. Alloys. Comp.408-412 1368 - 1372 2006年査読
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V. Provenzano, B. Baumgold, R.D. Shull, A.J. Shapiro, K. Koyama, K. Watanabe, N.K. Singh, K.G. Suresh, A.K. Nigam, S.K. Malik . Structure and magnetocaloric properties of the Fe-doped HoTiGe alloy . J. Appl. Phys.99 08K906 2006年査読
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F. Ishikawa, K. Koyama, K. Watanabe, T. Asano, and H. Wada . First-order phase transition at the Curie temperature in MnAs and MnAs0.9Sb0.1 . J. Phys. Soc. Jpn75 84604 2006年査読
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H. Yabuta, K. Umeo, T. Takabatake, K. Koyama and K. Watanabe . Temperature- and field-induced first-order ferromagnetic transitions in MnFe(P1-xGex) . J. Phys. Soc. Jpn75 113707 2006年査読
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K. Koyama, H. Okada, K. Watanabe, T. Kanomata, R. Kainuma, W. Ito, K. Oikawa, K. Ishida . Observation of large magnetoresistance of magnetic Heusler alloy Ni50Mn36Sn14 in high magnetic fields . Appl. Phys. Lett.89 182510 2006年査読
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K. Koyama, T. Kanomata, R. Kainuma, K. Oikawa, K. Ishida and K. Watanabe, . High field X-ray diffraction measurements of novel ferromagnetic shape-memory alloy Ni50Mn36Sn14 . Physica B383 24 - 26 2006年査読
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K. Koyama, K. Watanabe, T. Kanomata, R. Kainuma, K. Oikawa, and K. Ishida . Observation of field-induced reverse transformation in ferromagnetic shape memory alloy Ni50Mn36Sn14 . Appl. Phys. Lett.88 132505 2006年査読
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V.A. Chernenko, V.A. Lvov, T. Kanomata, T. Kakeshita, K. Koyama and S. Besseghini . Martensitic transformation in Ni-Mn-Ga alloy under high magnetic fields . Mater. Trans.47 635 - 638 2006年査読
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K. Koyama, T. Kanomata, T. Watanabe, T. Suzuki, H. Nishihara, and K. Watanabe . X-ray powder diffraction studies of Mn3Ga0.97Al0.03C in magnetic fields . Mater. Trans. 47 492 - 495 2006年査読
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K. Yagasaki, S. Notsu, Y. Takaesu, T. Nakama, E. Sakai, K. Koyama, K. Watanabe and A.T. Burkov . X ray diffraction on rare earth-3d Laves phase compound of ErCo2 in magnetic field . Physica B378-380 1089 - 1090 2006年査読
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S.V. Demishev, A.V. Semeno, A.A. Pronin, N.E. Sluchanko, N.A. Samarin, H. Ohta, S. Okubo, M. Kimata, K. Koyama, M. Motokawa and A.V. Kuznetsov . Low-temperature study of the quantum critical phenomena in CuGeO3:Fe . J. Magn. Magn. Matter.300 e346 - e349 2006年査読
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M. Kimata, H. Ohta, K. Koyama, M. Motokawa, R. Kondo, S. Kagoshima, H. Tanaka, M. Tokumoto, H. Kobayashi, and A. Kobayashi . Fermi surface study of organic conductors using a magneto-optical measurement under high magnetic fields . J. Phys.: Conf. Ser.51 359 - 362 2006年査読
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M. Kimata, Y. Oshima, K. Koyama, H. Ohta, M. Motokawa, H. Nishikawa, K. Kikuchi, I. Ikemoto . Detailed fermi surface topology of the quasi-one-dimensional conductor (DMET)2I3 . J. Low Temp. Phys.142 523 - 526 2006年査読
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H. Kato, T. Akiya, M. Sagawa, K. Koyama, T. Miyazaki . Field-induced alignment of Nd-rich phase and coercivity in sintered Nd-Fe-B magnets . INTERMAG 2006 - IEEE International Magnetics Conference 914 2006年
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Hironari Okada, Keiichi Koyama, Kazuo Watanabe . Specific heat measurement of the spinel compound CuV2S4 . LOW TEMPERATURE PHYSICS, PTS A AND B850 1317 - + 2006年査読
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A. Himori, S. Ohishi, K. Koyama, K. Watanabe, T. Shigeoka . Multistep metamagnetism of NdRh2Ge2 single crystal . YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS51 63 - + 2006年
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T. Hori, K. Koyama, H. Shiraishi, K. Watanabe . Magnetic properties of Nd(x)Erl(1-x)Mn(6)Sn(6) alloys . YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS51 47 - + 2006年
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A. V. Andreev, E. Santava, Y. Homma, K. Koyama, T. Yamamura, Y. Shiokawa . Magnetic anisotropy of U2Co17-xSix single crystals. . Recent Advances in Actinide Science, May, I.; Alvares, R.; Bryan, N., Eds. The Royal Society of Chemistry: Cambridge 758 - 760 2006年査読
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A. V. Andreev, K. Koyama, N. V. Mushnikov, V. Sechovsky, Y. Shiokawa, I. Satoh, K. Watanabe . Interplay between effects of external pressure and dilution of the U-sublattice in UCoAl-based materials: the U0.94Y0.06CoAl case . High Pressure Research26 ( 4 ) 475 - 478 2006年
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H. Kato, K. Koyama, T. Miyazaki . Effect of high-magnetic-field annealing on the magnetic properties of Nd-Co-B nanocomposite ribbons . INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference 167 2005年12月
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M. Kimata, Y. Oshima, K. Koyama, H. Ohta, M. Motokawa, H. M. Yamamoto, R. Kato . Fermi surface study of β′′-(BEDT-TTF)(TCNQ) by magnetooptical measurements . Synthetic Metals153 ( 1-3 ) 369 - 372 2005年9月
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JL Her, K Koyama, K Watanabe, Provenzano, V, AQ Fu, AJ Shapiro, RD Shull . High-magnetic field X-ray diffraction studies on Gd-5(Ge2-xFex)Si-2 (x=0.05 and 0.2) . MATERIALS TRANSACTIONS46 ( 9 ) 2011 - 2014 2005年9月
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M Kimata, K Koyama, H Ohta, Y Oshima, M Motokawa, H Nishikawa, K Kikuchi, Ikemoto, I . Development and applications of magnetooptical measurement system equipped with a rotational resonant cavity in the millimeter-wave region . JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS44 ( 7A ) 4930 - 4934 2005年7月
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H. Kato, M. Ishizone, K. Koyama, T. Miyazaki . Realization of anisotropic nanocomposite magnet in Nd<inf>2</inf>Fe <inf>14</inf>B/α-Fe thin films . Journal of Magnetism and Magnetic Materials290 1221 - 1225 2005年4月
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S Miura, K Koyama, H Okada, T Shigeoka, K Watanabe . High-field X-ray diffraction measurement of SmMn2Ge2 . JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS44 ( 3 ) 1258 - 1259 2005年3月
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S. Okubo, D. Fukuoka, M. Kimata, H. Ohta, Y. Inagaki, T. Kumimoto, K. Koyama, M. Motokawa, Z. Hiroi . Oshikawa-Affleck electron spin resonance behavior observed in one-dimensional antiferromagnet BaCu2(Si1-xGex)2O7 (x=0.65) . J. Phys. Soc. Jpn, Suppl.74 80 - 85 2005年1月査読
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T. Tsutaoka, Y. Nakamori, K. Koyama and T. Tokunaga . Magnetic and electrical properties of Gd7Rh3 single crystal . J. Magn. Magn. Mater.293 768 - 773 2005年査読
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H. Okada, K. Koyama and K. Watanabe . Transport, magnetic, thermal and structural properties of the spinel compound CuTi2S4 . J. Alloys Comp.403 34 - 37 2005年査読
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K. Koyama, T. Kanomata and K. Watanabe . High field X-ray diffraction studies on MnFeP0.5As0.5 . Jpn. J. Appl. Phys., 44 L549 - L551 2005年査読
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H. Kato, M. Ishizone, K. Koyama and T. Miyazaki . Realization of anisotropic nanocomposite magnet in Nd2Fe14B/a-Fe thin films . J. Magn. Magn. Mater.290-291 1221 - 1225 2005年査読
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J.L. Her, K. Koyama, K. Watanabe, V. Provenzano, A. Fu, A.J. Shapiro, and R.D. Shull . High field X-ray diffraction studies on Gd5(Ge2-xFex)Si2 (x=0.05 and 0.2) . Mater. Trans.46 2011 - 2014 2005年査読
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K. Koyama, T. Kanomata, T. Matsukawa and K. Watanabe . Magnetic field effect on structural property of MnFeP0.5As0.5 . Mater. Trans.46 1753 - 1756 2005年査読
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T. Kanomata, T. Nozawa, D. Kikuchi, H. Nishihara, K. Koyama and K. Watanabe . Magnetic properties of ferromagnetic shape memory alloys Ni2-xCuxMnGa . Int. J Appl. Electromagnetics and Mechanics21 151 - 157 2005年査読
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S. Miura, K. Koyama, H. Okada, T. Shigeoka and K. Watanabe, . High-field X-ray diffraction measurements of SmMn2Ge2 . Jpn. J. Appl. Phys.44 1258 - 1259 2005年査読
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M. Yoshida, K. Koyama, A. Ochiai, and M. Motokawa . Cyclotron resonance in rare-earth monopnictides . Phys. Rev. B71 75102 2005年査読
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M. Kimata, Y. Oshima, K. Koyama, H. Ohta, M. Motokawa, H.M. Yamamoto, R. Kato . Fermi surface study of β”-(BEDT-TTF)(TCNQ) by magnetooptical measurements . Synthetic Metals153 369 - 372 2005年査読
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S.V. Demishev, A.V. Semeno, N.E. Sluchanko, N.A. Samarin, A.A. Pronin, V.V. Glushkov, H. Otha, S. Okubo, M. Kimata, K. Koyama, M. Motokawa, A.V. Kuznetsov . Disorder-driven quantum critical behaviour in CuGeO3 doped with magnetic impurity . Physica B359-361 1315 - 1317 2005年査読
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M. Kimata, K. Koyama, H. Ohta, Y. Oshima, M. Motokawa, H. Nishikawa, K. Kikuchi and I. Ikemoto . The development and the applications of the magnetooptical measurement system equipped with a rotational resonant cavity in the millimeter-wave region . Jpn. J. Appl. Phys.44 4930 - 4934 2005年査読
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S.V. Demishev, A. Semeno, A. Proin, N. Sluchanko, N. Samarin, H. Ohta, S. Okubo, M. Kimata, K. Koyama, M. Motokawa, . The competition between staggered field and antiferromagnetic interaction in CuGeO3:Fe . Prog. Theor. Phys. suppl.159 387 - 391 2005年査読
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H. Ohta, M. Kimata, K. Koyama, Y. Oshima, M. Motokawa, H. Nishikawa, K. Kikuchi, I. Ikemoto . Magneto-optical measurement of organic conductor using rotational cavity system . Int. J. Infrared and Millimeter Wave26 1525 - 1530 2005年査読
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T. Sakon, K. Koyama, M. Motokawa, A. Muller, B. Barbara, Y. Ajiro . Detailed ESR measurements for the quantum molecular magnet V15 at ultra-low temperatures . Prog. Theor. Phys. suppl.159 302 - 307 2005年査読
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KIMATA M, OHTA H, KOYAMA K, OSHIMA Y, MOTOKAWA M, YAMAMOTO H, KATO R . Development of the High Field Magneto-optical Measurement System with a Rotational Cavity . in High magnetic Fields in Semiconductor Physics, Yong-Jie Wang, Lloyd Engel and N. Bonesteel Eds.World Scientific, Singapore 35 2005年査読
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M Kimata, H Ohta, K Koyama, OSHIMA Y, M Motokawa, YAMAMOTO M H, KATO R . Development of the High Field Magneto-optical Measurement System with a Rotational Cavity for the Study of Organic Conductors, in High magnetic Fields in Semiconductor Physics, Yong-Jie Wang, Lloyd Engel and N. Bonesteel Eds. . World Scientific, Singapore, 2005pp355-358. 2005年
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Susumu Okubo, Daisuke Fukuoka, Motoi Kimata, Hitoshi Ohta, Yuji Inagaki, Takashi Kumimoto, Keiichi Koyama, Mitsuhiro Motokawa, Zenji Hiroi . Oshikawa-Affleck Electron Spin Resonance Behavior Observed in One-Dimensional Antiferromagnet BaCu2(Si1-xGex)(2)O-7 (x=0.65) . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN74 2005年査読
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S Demishev, A Semeno, A Pronin, N Sluchanko, N Samarin, H Ohta, S Okubo, M Kimata, K Koyama, M Motokawa . The competition between staggered field and antiferromagnetic interactions in CuGeO3 : Fe . PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT159 ( 159 ) 387 - 391 2005年
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K Irisawa, A Fujita, K Fukamichi, M Yamada, H Mitamura, T Goto, K Koyama . Transition between antiferromagnetic and ferromagnetic states in itinerant-electron La(FexAl1-x)(13) compounds . PHYSICAL REVIEW B70 ( 21 ) 1 - 16 2004年12月
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M Kimata, H Ohta, K Koyama, Y Oshima, M Motokawa, HM Yamamoto, R Kato . Development of the high field magneto-optical measurement system with a rotational cavity for the study of organic conductors . INTERNATIONAL JOURNAL OF MODERN PHYSICS B18 ( 27-29 ) 3803 - 3806 2004年11月
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H Okada, K Koyama, S Miura, M Yamada, T Goto, Y Makihara, H Fujii, K Watanabe . Pressure effect on the magnetic properties of Ce(Fe1-xCox)(2) . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN73 ( 7 ) 1982 - 1986 2004年7月
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T Hasebe, S Okada, M Ishizuka, T Tsurudome, T Ito, H Ookubo, J Sakuraba, K Watanabe, S Awaji, K Koyama, G Nishijima, K Takahashi . Design of a cryocooler-cooled large bore superconducting magnet for a 30 T hybrid magnet . IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY14 ( 2 ) 368 - 371 2004年6月
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A Fujita, K Fukamichi, K Koyama, K Watanabe . X-ray diffraction study in high magnetic fields of magnetovolume effect in itinerant-electron metamagnetic La(Fe0.88Si0.12)(13) compound . JOURNAL OF APPLIED PHYSICS95 ( 11 ) 6687 - 6689 2004年6月
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B Ohta, S Okubo, D Fukuoka, Y Inagaki, T Kunimoto, M Kimata, K Koyama, M Motokawa, Z Hiroi . Breather excitation observed by high-field ESR in one-dimensional antiferromagnet BaCu2(Si1-xGex)(2)O-7 (x=0.65) . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS272 929 - 930 2004年5月
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Keiichi Koyama, Takeshi Kanomata, Tatsuo Watanabe, Takanori Suzuki, Hironori Nishihara, Kazuo Watanabe . Magnetic transitions in Mn3Ga1-xAlxC (0 <= x <= 0.1) . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS272 E615 - E617 2004年5月査読
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M Itoi, A Taira, M Enomoto, N Matsushita, N Kojima, Y Kobayashi, K Asai, K Koyama, T Nakano, Y Uwatoko, J Yamaura . Crystal structure and structural transition caused by charge-transfer phase transition for iron mixed-valence complex (n-C3H7)(4)N[(FeFeIII)-Fe-II(dto)(3)] (dto = C2O2S2) . SOLID STATE COMMUNICATIONS130 ( 6 ) 415 - 420 2004年5月
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Y Makihara, K Koyama, K Fukushima, K Watanabe, H Fujii . X-ray diffraction study on Ce(Fe1-xCox)(2) in high field at low temperature . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS272 608 - 610 2004年5月
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K Koyama, K Fukushima, M Yamada, T Goto, Y Makhara, H Fujii, K Watanabe . High-field X-ray diffraction and high-pressure magnetization measurements of the pseudobinary compound Ce(Fe0.9Co0.1)(2) . PHYSICA B-CONDENSED MATTER346 187 - 190 2004年4月
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Y Oshima, M Kimata, K Kishigi, H Ohta, K Koyama, M Motokawa, H Nishikawa, K Kikuchi, Ikemoto, I . Observation of high-order quasi-one-dimensional periodic orbit resonance in (DMET)(2)I-3 and its Fermi surface . PHYSICA B-CONDENSED MATTER346 387 - 391 2004年4月
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M. Kimata, Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H. M. Yamamoto, R. Kato . Magnetooptical measurements of β″-(BEDT-TTF)(TCNQ) . Physica B: Condensed Matter346 382 - 386 2004年4月
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K Koyama, K Fukushima, Y Makihara, H Fujii, K Watanabe . X-ray diffraction study on the pseudobinary compound Ce(Fe0.9Co0.1)(2) in high magnetic fields . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN73 ( 3 ) 676 - 680 2004年3月
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O. Nashima, T. Kanomata, Y. Yamaguchi, S. Abe, T. Harada, T. Suzuki, H. Nishihara, K. Koyama, T. Shishido, K. Watanabe and T. Kaneko . Magnetic and electrical properties of Fe3-xVxSi . J. Alloys and Compounds383 298 - 301 2004年査読
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H. Wada, H. Yoshida, T. Goto and K. Koyama . Field-induced magnetic transitions of exchange competing system GdMn2Ge2 . J. Magn. Magn. Matter.272-276 591 - 592 2004年査読
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K. Koyama, T. Kanomata, T. Watanabe, T. Suzuki, H. Nishihara, and K. Watanabe . Magnetic transitions in Mn3Ga1-xAlxC (0<x<0.1) . J. Magn. Magn. Matter.272-276 e615 - e617 2004年査読
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T. Fujiwara, Y. Uwatoko, H. Fujii, K. Koyama, M. Motokawa, and T. Shigeoka . The correlation between the phase transition and valence change of the Yb ionic state induced upon pressurization in YbMn2Ge2 . J. Magn. Magn. Matter.272-276 599 - 600 2004年査読
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X. Fan, T. Mashimo, X. Huang, T. Kagayama, A. Chiba, K. Koyama and M. Motokawa . Magnetic properties of Co-Cu metastable solid solution alloys . Phys. Rev. B69 94432 2004年査読
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H. Okada, K. Koyama and K. Watanabe . Two-step structural modulations and Fermi liquid state in spinel compound CuV2S4 . J. Phys. Soc. Jpn.73 3227 - 3230 2004年査読
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H. Okada, K. Koyama, S. Miura, M. Yamada, T. Goto, Y. Makihara, H. Fujii, K. Watanabe, . Pressure effect on the magnetic properties of Ce(Fe1-xCox)2 . J. Phys. Soc. Jpn.73 1982 - 1986 2004年査読
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A. Fujita, K. Fukamichi, K. Koyama, and K. Watanabe . X-ray diffraction study in high magnetic fields of magnetovolume effect in itinerant-electron metamagnetic La(Fe0.88Si0.12)13 compound . J. Appl. Phys.95 6687 - 6689 2004年査読
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M. Kimata, Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H.M. Yamamoto, and R. Kato . Magnetooptical measurement of β’’-(BEDT-TTF)(TCNQ) . Physica B346-347 382 - 386 2004年査読
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K. Kobayashi, T. Akiya, H. Kato and K. Koyama . Relation between a specific lattice expansion and magnetic anisotropy in Sm2Fe17Nx (0<x<3) samples of intermediate nitrogen concentration . proceedings for 18th workshop on high performance magnets & their applications, (Annecy, 2004) 521 - 528 2004年査読
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K. Watanabe, G. Nishijima, S. Awaji, K. Takahashi, K. Koyama, M. Motokawa, M. Ishizuka, T. Hasebe, and J. Sakuraba . Advances in the first cryogen-free hybrid magnet . IEEE Trans. Appl. Superc. 14 388 - 392 2004年査読
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T. Hasebe, S. Okada, M. Ishizuka, T. Tsurudone. T. Ito, H. Ookubo, J. Sakuraba, K. Watanabe, S. Awaji, K. Koyama, G. Nishijima, and K. Takahashi . Design of a cryocooler-cryocooled large bore superconducting magnet for a 30T hybrid magnet . IEEE Trans. Appl. Superc.14 368 - 371 2004年査読
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T. Kurusu, M. Ono, S. Hanai, M. Kyoto, H. Takigami, H. Takano, K. Watanabe, S. Awaji, K. Koyama, G. Nishijima, K. Togano . A cryocooler-cooled 19 T superconducting magnet with 52 mm room temperature bore . IEEE Trans. Appl. Superc.14 393 - 396 2004年査読
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K. Watanabe, S. Awaji, G. Nishijima, K. Takahashi, K. Koyama, M. Motokawa, and N. Kobayashi . Magnet technology and materials research at the High-Field Laboratory for Superconducting Materials . Physica B346-347 618 - 622 2004年査読
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K. Takahashi, C. Umeki, I. Mogi, K. Koyama, S. Awaji, M. Motokawa, and K. Watababe . Magnetic orientation of paraffin in a magnetic levitation furnace . Physica B346-347 277 - 281 2004年査読
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H. Kato, T. Miyazaki, M. Sagawa and K. Koyama . Coercivity enhancements by high-magnetic-field annealing in sintered Nd-Fe-B magnets . Appl. Phys. Lett.84 4230 - 4232 2004年査読
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K. Irisawa, A. Fujita, K. Fukamichi, M. Yamada, H. Mitamura, T. Goto and K. Koyama . Transition between antiferromagnetic and ferromagnetic states in itinerant-electron La(FexAl1-x)13 compounds . Phys. Rev. B70 214405 2004年査読
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K. Koyama, M. Sakai, T. Kanomata and K. Watanabe . Field-induced martensitic transformation in new ferromagnetic shape memory compound Mn1.07Co0.92Ge . Jpn. J. Appl. Phys.43 8036 - 8039 2004年査読
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D. Kikuchi, T. Kanomata, Y. Yamaguchi, H. Nishihara, K. Koyama, and K. Watanabe . Magnetic properties of ferromagnetic shape memory alloys Ni2Mn1-xFexGa . J. Alloys and Compounds383 184 - 188 2004年査読
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Y. Makihara, K. Koyama, K. Fukushima, K. Watanabe, and H. Fujii . X-ray diffraction study on Ce(Fe1-xCox)2 in high field at low temperature . J. Magn. Magn. Matter.272-276 608 - 610 2004年査読
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K. Koyama, K. Fukushima, Y. Makihara, H. Fujii, and K. Watanabe . X-ray diffraction study on the psudobinary compound Ce(Fe0.9Co0.1)2 in high magnetic fields . J. Phys. Soc. Jpn.73 676 - 680 2004年査読
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F. Ishikawa, K. Koyama, K. Watanabe, and H. Wada, . X-ray diffraction study of the structural phase transition in MnAs under high magnetic fields . Physica B346-347 408 - 412 2004年査読
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K. Koyama, K. Fukushima, M. Yamada, T. Goto, Y. Makihara, H. Fujii, and K. Watanabe . High field x-ray diffraction and high pressure magnetization measurements of the pseudobinary compound Ce(Fe0.9Co0.1)2 . Physica B346-347 187 - 190 2004年査読
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F. Ishikawa, K. Koyama, K. Watanabe, T. Asano, and H. Wada . Structural transformation of MnAs1-xSbx under high magnetic fields . Mater. Trans.45 311 - 314 2004年査読
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Y. Oshima, M. Kimata, K. Kishigi, H. Ohta, K. Koyama, M. Motokawa, H. Nishikawa, K. Kikuchi, and I. Ikemoto . Observation of high-order quasi-one-dimensional periodic orbit resonance in (DMET)2I3 and its Fermi surface . Physica B346-347 387 - 391 2004年査読
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M. Kimata, H. Ohta, K. Koyama, Y. Oshima, M. Motokawa, H.M. Yamamoto, R. Kato . Development of high field magneto-optical measurement system with a rotational cavity for the study of organic conductors . Int. J. Mod. Phys.18 3803 - 3806 2004年査読
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M. Yoshida, K. Koyama, M. Shirakawa, A. Ochiai, K. Watanabe, and M. Motokawa . Cyclotron resonance measurements of the high-quality single crystal GdSb . J. Magn. Magn. Matter.272-276 495 - 496 2004年査読
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H. Ohta, O. Okubo, K. Fukuoka, Y. Inagaki, T. Kunimoto, M. Kimata, K. Koyama, M. Motokawa and Z. Hiroi . Breather excitation observed by high-field ESR in one-dimensional antiferromagnet BaCu2(Si1-xGex)2O7 (x = 0.65) . J. Magn. Magn. Matter272-276 929 - 930 2004年査読
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K. Koyama, T. Tomimatsu, M. Yoshida, D.X. Li, and M. Motokawa . ESR measurements of GdBi . Physica B346-347 155 - 159 2004年査読
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T. Sakon, K. Koyama, M. Motokawa, Y. Ajiro, and B. Barbara, "ESR experiments of molecular magnet V15 at ultra-low temperatures . ESR experiments of molecular magnet V15 at ultra-low temperatures . Physica B346-347 206 - 210 2004年査読
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Fumihiro Ishikawa, Keiichi Koyama, Kazuo Watanabe, Tetsuya Asano, Hirofumi Wada . Structural Transformation of MnAs1-xSbx under High Magnetic Fields . Materials Transactions45 ( 2 ) 311 - 314 2004年査読
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H Ohta, M Kimata, K Koyama, Y Oshima, M Motokava, H Nishikawa, K Kikuchi, Ikemoto, I . Millimeter wave magneto-optical measurement of organic conductors using a rotational cavity . CONFERENCE DIGEST OF THE 2004 JOINT 29TH INTERNATIONAL CONFERENCE ON INFRARED AND MILLIMETER WAVES AND 12TH INTERNATIONAL CONFERENCE ON TERAHERTZ ELECTRONICS 379 - 380 2004年
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M Yoshida, K Koyama, M Motokawa . Cyclotron resonance experiments on rare-earth monopnictides . JOURNAL OF PHYSICS-CONDENSED MATTER15 ( 28 ) S2119 - S2122 2003年7月
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Keiichi Koyama, Makoto Yoshida, Dexin Li, Mitsuhiro Motokawa . Electron Spin Resonance of GdX (X=P, As, Sb and Bi) . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN72 2003年6月査読
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T Sakon, K Koyama, M Motokawa, H Nojiri, T Asano, Y Ajiro . Electron spin resonance measurements at ultralow temperatures . PHYSICA B-CONDENSED MATTER329 1629 - 1631 2003年5月
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T. Suzuki, H. Matsui, H. Tsuchiya, E. Negishi, K. Koyama, N. Toyota . Antiferromagnetic resonance in λ-(BEDT-TSF)<inf>2</inf>FeCl <inf>4</inf> . Synthetic Metals135 ( 1-3 ) 567 - 568 2003年4月
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Y Oshima, H Ohta, K Koyama, M Motokawa, H Nishikawa, K Kikuchi, Ikemoto, I . Magnetooptical measurements of quasi-one-dimensional conductor (DMET)(2)I-3 . SYNTHETIC METALS135 ( 1-3 ) 531 - 532 2003年4月
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H. Ohta, Y. Oshima, Y. Inagaki, S. Okubo, M. Kimata, K. Koyama, M. Motokawa, T. Mori . Magneto-optical measurements of β-(BEDT-TTF)<inf>2</inf>AuI <inf>2</inf> . Synthetic Metals135 ( 1-3 ) 527 - 528 2003年4月
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Tsutomu Mashimo, Xinsheng Huang, Xu Fan, Keiichi Koyama, Mitsuhiro Motokawa . Erratum: Slater-Pauling curve of Fe-Cu solid solution alloys (Physical Review B - Condensed Matter and Materials Physics (2002) 66 (132407)) . Physical Review B - Condensed Matter and Materials Physics67 999021 2003年3月
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K Koyama, H Sasaki, T Kanomata, K Watanabe, M Motokawa . Magnetization measurements of weak itinerant electron ferromagnet Ni-Pt alloy . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN72 ( 3 ) 767 - 768 2003年3月
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T Suzuki, H Matsui, H Tsuchiya, E Negishi, K Koyama, N Toyota . Antiferromagnetic resonance in lambda-(BEDT-TSF)(2)FeCl4 . PHYSICAL REVIEW B67 ( 2 ) 2003年1月査読
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K. Koyama, H. Sasaki, T. Kanomata, K. Watanabe and M. Motokawa . Magnetic properties of weak itinerant ferromagnet Ni-Pt alloy . Physica B319-333 1121 - 1122 2003年査読
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H. Wada, H. Yoshida, T. Goto, K. Koyama and K. Watanabe . Novel field-induced magnetic transitions of GdMn2Ge2 . J. Phys. Soc. Jpn72 3197 - 3203 2003年査読
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K. Koyama, H. Sasaki, T. Kanomata, K. Watanabe and M. Motokawa . Magnetization measurements of weak itinerant ferromagnet Ni-Pt alloy . J. Phys. Soc. Jpn72 767 - 768 2003年査読
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高橋弘紀、梅木千巧、茂木巌、淡路智、小山佳一、本河光博、渡辺和雄 . 磁気浮上状態で溶融凝固したパラフィンの配向効果 . 日本応用磁気学会誌27 1125 - 1129 2003年査読
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F. Ishikawa, K. Koyama, K. Watanabe, and H. Wada . Field induced structural transformation in MnAs . Jpn. J. Appl. Phys.42 L918 - L920 2003年査読
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T. Tomimatsu, K. Koyama, M. Yoshida, D.X. Li and M. Motokawa . Observation of antiferromagnetic resonance affected by hyperfine interaction in GdBi . Phys. Rev. B67 14406 2003年査読
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K. Koyama, M. Yoshida, D.X. Li and M. Motokawa . Electron spin resonance of GdX (X=P, As, Sb and Bi) . J. Phys. Soc. Jpn. Suppl. B.72 145 - 150 2003年査読
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T. Sakon, H. Nojiri, K. Koyama, T. Asano, Y. Ajiro and M. Motokawa . ESR measurements at ultra-low temperatures using a dilution refrigerator . J. Phys. Soc. Jpn. Suppl. B72 140 - 144 2003年査読
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H. Ohta, Y. Oshima, Y. Inagaki, S. Okubo, M.Kimata, K. Koyama, M. Motokawa and T. Mori . Magneto-optical measurements of β-(BEDT-TTF)2AuI2 . Synthetic Metals135-136 527 - 528 2003年査読
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Y. Oshima, M. Kimata, K. Kishigi. H. Ohta, K. Koyama, M. Motokawa, H. Nishikawa, K. Kikuchi and I. Ikemoto . Fermi surface study of quasi-one-dimensional metals using magneto-optical techniques . Phys. Rev. B68 54526 2003年査読
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T. Suzuki, H. Matsui, H. Tsuchiya, E. Negishi, K. Koyama, and N. Toyota . Antiferromagnetic resonance in λ-(BEDT-TSF)2FeCl4 . Synthetic Metals135-136 567 - 568 2003年査読
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M. Yoshida, K. Koyama and M. Motokawa . Cyclotron resonance experiments in rare-earth monopnictides . J. Phys.: Condenced Matter15 S2119 - S2122 2003年査読
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T. Sakon, K. Koyama, M. Motokawa, H. Nojiri, T. Asano, Y. Ajiro . Electron spin resonance measurements at ultralow temperature . Physica B329 1629 - 1631 2003年査読
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M. Yoshida, K. Koyama, T. Tomimatsu, M. Shirakawa, A. Ochiai and M. Motokawa . Observation of cyclotron resonance in CeSb . Physica B329-333 557 - 558 2003年査読
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M. Yoshida, K. Koyama, T. Tomimatsu, M. Shirakawa, A. Ochiai and M. Motokawa . Doppler-shifted cyclotron resonance with Alfven waves in LaSb . Physica B329-333 1092 - 1093 2003年査読
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M. Yoshida, K. Koyama, M. Shirakawa, A. Ochiai, K. Watanabe, and M. Motokawa . Cyclotron resonance and magnetic resonance in GdSb . J. Phys. Soc. Jpn.73 1763 - 1767 2003年査読
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Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H.M. Yamamoto, R. Kato, M. Tamura, Y. Nishio and K. Kajita . Fermi surface study of quasi-two dimensional organic conductors by magnetooptical measurements . J. Phys. Soc. Jpn72 143 - 148 2003年査読
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Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H. Nishikawa, K. Kikuchi and I. Ikemoto . Magnetooptical measurements of quasi-one-dimensional conductor (DMET)2I3 . Synthetic Metals135-136 531 - 532 2003年査読
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Y. Oshima, H. Ohta, H.M. Yamamoto, R. Kato, K. Koyama, and M. Motokawa . Magnetooptical measurements of BEDT-TTF salts containing supramolecular assemblies . Synthetic Metals133-134 453 - 454 2003年査読
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M. Yoshida, K. Koyama, P.C. Canfield, C. Cunningham, S. Nimori, K. Watanabe and M. Motokawa . Cyclotron resonance in PrSb . J. Phys. Soc. Jpn.72 705 - 708 2003年査読
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T. Suzuki, H. Matsui, H. Tsuchiya, E. Negishi, K. Koyama, and N. Toyota, . Antiferromagnetic resonance in λ-(BEDT-TSF)2FeCl4 . Phys. Rev.B67 020408(R) 2003年査読
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N. Toyota, T. Suzuki, H. Matsui, H. Tsuchiya, E. Negishi, K. Koyama . Antiferromagnetic resonance in (formula presented) . Physical Review B - Condensed Matter and Materials Physics67 ( 2 ) 2003年
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Keiichi Koyama, Makoto Yoshida, Dexin Li, Mitsuhiro Motokawa . Electron spin resonance of GdX (X=P, As, Sb and Bi) . Journal of the Physical Society of Japan72 145 - 150 2003年
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H Fujii, Sasaki, I, K Koyama . Interstitial alloys as hard magnetic materials . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS242 59 - 65 2002年4月
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T Sakon, K Koyama, M Motokawa . Electron spin resonance experiments at ultralow temperatures by means of a dilution refrigerator . REVIEW OF SCIENTIFIC INSTRUMENTS73 ( 3 ) 1242 - 1246 2002年3月
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K. Koyama, T. Goto, T. Kanomata and R. Note . Magnetization measurement of MnSi just above the critical pressure . Physica B312-313 485 - 486 2002年査読
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T. Fujiwara, H. Fujii, K. Koyama and M. Motokawa . Novel magnetism on single crystalline YbMn2Ge2 . Physica B312-313 864 - 866 2002年査読
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Kanomata, T. Narita, N. Suzuki, K. Sato, T. Harada, N. Oogawara, K. Koyama and M. Motokawa . Electrical properties of the transition metal compound MnRhP . J. Alloys and Compounds334 68 - 71 2002年査読
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T. Mashimo, X. Huang, X. Fan, K. Koyama and M. Motokawa . Slater-Pauling curve of Fe-Cu solid solution alloys . Phys. Rev. B66 132407 2002年査読
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H. Fujii, I. Sasaki and K. Koyama . Interstitial alloy as hard magnetic materials . J. Magn. Magn. Mater. 242-245 59 - 65 2002年査読
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T. Sakon, K. Koyama and M. Motokawa . Electron spin resonance experiments at ultra-low temperature by means of a dilution refrigerator . Rev. Sci. Instrum.73 1242 - 1246 2002年査読
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M. Yoshida, K. Koyama, T. Tomimatsu, M. Shirakawa, A. Ochiai and M. Motokawa . Observation of cyclotron resonance on LaBi . Physica B322 306 - 307 2002年査読
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M. Yoshida, K. Koyama, T. Tomimatsu, M. Shirakawa, A. Ochiai and M. Motokawa . The observation of cyclotron resonance in LaSb . Physica B312-313 684 - 685 2002年査読
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T. Tomimatsu, K. Koyama, M. Yoshida, D.X. Li and M. Motokawa . Magnetic resonance of GdBi . Physica B312-313 682 - 683 2002年査読
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K. Koyama,T. Tomimatsu, M. Yoshida, D.X. Li and M. Motokawa . Observation of cyclotron resonance on GdSb . Physica B312-313 680 - 681 2002年査読
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K. Koyama, M. Yoshida, T. Tomimatsu, T. Sakon, D.X.. Li, M. Shirakawa, A. Ochiai and M. Motokawa . Observation of cyclotron resonance in rare-earth monopnictides by millimeter microwave region . J. Phys. and Chem. of Solids.63 1227 - 1230 2002年査読
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M. Yoshida, K. Koyama, M. Shirakawa, A. Ochiai, K. Watanabe and M. Motokawa . Cyclotron resonance in CeSb . J. Phys. Soc. Jpn.71 2847 - 2850 2002年査読
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Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H.M. Yamamoto and R. Kato . Observation on high-order harmonic resonance in magnetooptical measurements of (BEDT-TTF)2Br(DIA) . J. Phys. Soc. Jpn. 71 1031 - 1034 2002年査読
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M. Yoshida, K. Koyama, T. Tomimatsu, M. Shirakawa,A. Ochiai and M. Motokawa . Determination of cyclotron effective masses on LaSb . J. Phys. Soc. Jpn.71 1752 - 1756 2002年査読
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M. Yoshida, K. Koyama, M. Shirakawa, A. Ochiai, K. Watanabe and M. Motokawa . Observation of Doppler-shifted cyclotron resonance in LaSb . Phys. Rev. B66 233107 2002年査読
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M. Motokawa, M. Yoshida, K. Koyama . Nonlinear cyclotron resonance of rare-earth semimetals . Conference Digest - 27th International Conference on Infrared and Millimeter Waves, IRMMW 2002 Pl11 - Pl12 2002年
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Keiichi Koyama, Makoto Yoshida, Takahiro Tomimatsu, Takuo Sakon, Dexin Li, Makoto Shirakawa, Akira Ochiai, Mitsuhiro Motokawa . Observation of cyclotron resonance in rare-earth monopnictides microwave region . Journal of Physics and Chemistry of Solids63 ( 6-8 ) 1227 - 1230 2002年
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T Sakon, H Nojiri, K Koyama, T Asano, Y Ajiro, M Motokawa . Electron spin resonance study of Cu benzoate using a He-3-He-4 dilution refrigerator . JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN70 ( 8 ) 2259 - 2262 2001年8月
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H. Kato, M. Ishizone, T. Miyazaki, K. Koyama, H. Nojiri, M. Motokawa, T. Ishizaki . High-frequency ferromagnetic resonance in Nd<inf>2</inf>Fe<inf>14</inf>B/α-Fe nanocomposite films . IEEE Transactions on Magnetics37 ( 4 ) 2567 - 2569 2001年7月
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Y. Oshima, H. Ohta, S. Okubo, K. Koyama, M. Motokawa, M. Tamura, Y. Nishio, K. Kajita . Fermi surface study of θ-(BEDT-TTF)<inf>2</inf>I<inf>3</inf> by cyclotron resonance measurements . Synthetic Metals120 ( 1-3 ) 853 - 854 2001年3月
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K Koyama, H Fujii, T Goto, H Fukuda, Y Janssen . Magnetic phase transitions of Ce2Fe17 under high pressures and high magnetic fields . PHYSICA B294 168 - 171 2001年1月
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K. Koyama, H. Fujii, T. Goto, H. Fukuda and Y. Janssen, . Magnetic phase transitions of Ce2Fe17 under high pressure and high magnetic fields . Physica B294-295 168 - 171 2001年査読
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T. Kanomata, T. Sasaki, T. Hoshi, T. Narita, T. Harada, H. Nishihara, T. Yoshida, R. Note, K. Koyama, H. Nojiri, T. Kaneko and M. Motokawa . Magnetic and electrical properties of Fe2+xV1-xAl . J. Alloys and Compounds317-318 390 - 394 2001年査読
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K. Koyama, T. Sakon, H. Nojiri and M. Motokawa . Observation of new ESR mode at ultra low temperatures and CR of RE compounds by VNA . proceedings for 26th IRMMW (Toulouse 2001) 1 - 6 2001年査読
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K. Koyama, T. Tomimatsu, M. Yoshida, D.X. Li and M. Motokawa . Cyclotron resonance of GdSb . J. Phys. Soc. Jpn.70 2371 - 2375 2001年査読
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M. Yoshida, K. Koyama, T. Tomimatsu, M. Shirakawa, A. Ochiai and M. Motokawa . Cyclotron resonance of LaBi . J. Phys. Soc. Jpn.70 2078 - 2081 2001年査読
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T. Sakon, H. Nojiri, K. Koyama, T. Asano, Y. Ajiro and M. Motokawa . Electron spin resonance study of Cu Benzoate using 3He-4He dilution refrigerator . J. Phys. Soc. Jpn.70 2259 - 2262 2001年査読
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K. Koyama, M. Yoshida, D.X. Li and M. Motokawa . Magnetic resonance of GdP . J. Phys. Soc. Jpn.70 2774 - 2777 2001年査読
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K. Koyama, M. Yoshida, T. Sakon, H. Nojiri, D.X. Li, T. Suzuki and M. Motokawa . ESR and CR measurements of Gd monopnictides . Physica B294-265 156 - 159 2001年査読
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M. Yoshida, K. Koyama, H. Hiraga, Y. Endoh and M. Motokawa . High field ESR measurements of CoS2 . Physica B294-295 145 - 148 2001年査読
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Y. Oshima, H. Ohta, S. Okubo, K. Koyama, M. Motokawa, M. Tamura, Y. Nishio and K. Kajita . High-field magnetooptical measurements of BEDT-TTF salts . Physica B294-295 431 - 434 2001年査読
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Y. Oshima, H. Ohta, S. Okubo, K. Koyama, M. Motokawa, M. Tamura, Y. Nishio and K. Kajita, . Fermi surface study of θ-(BEDT-TTF)2I3 by cyclotron resonance measurements . Synth. Metals. 120 853 - 854 2001年査読
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H. Ohta, Y. Oshima, T. Sakurai, S. Okubo, T. Tanaka, K. Koyama, M. Motokawa, H. Kikuchi, H. Nagasawa, J.P. Boucher . Observation of direct transition in S=1/2 quantum spin system Cu2(C5N12N2)2Cl4 by high field ESR . J. Magn. Magn. Mater. 226-230 439 - 440 2001年査読
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H. Kato, M. Ishizone, T. Miyazaki, K. Koyama, H. Nojiri and M. Motokawa . High-frequency ferromagnetic resonance in Nd2Fe14B/α-Fe nanocomposite films . IEEE Trans. Magn.37 2567 - 2569 2001年査読
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加藤宏明、石曽根昌彦、宮崎照宣、小山佳一、野尻浩之、本河光博 . 強磁性共鳴によるナノコンポジット磁石の交換結合の評価 . 日本応用磁気学会誌25 675 - 678 2001年査読
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Keiichi Koyama, Hironobu Fujii . Nitrogen gas-solid reaction process and basic magnetism of the interstitially modified rare-earth transition-metal nitrides and . Physical Review B - Condensed Matter and Materials Physics61 9475 - 9493 2000年1月
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K. Koyama, T. Goto, T. Kanomata and R. Note . Observation of an itinerant metamagnetic transition in MnSi under high pressure . Phys. Rev. B62 986 - 991 2000年査読
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K. Koyama and H. Fujii . Nitrogen gas-solid process and basic magnetism of the interstitially modified rare-earth 3d transition-metal nitrides R2Fe17N3 (R=Y, Ce, Nd, Sm) and Y2Co17N3 . Phys. Rev. B61 9475 - 9493 2000年査読
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K. Koyama, M. Yoshida, H. Nojiri, T. Sakon, M. Motokawa, D.X. Li and T. Suzuki . Magnetic resonance of GdAs . Physica B281-282 456 - 457 2000年査読
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K. Koyama, M. Yoshida, T. Sakon, D.X. Li, T. Suzuki and M. Motokawa . Cyclotron resonance of GdAs . J. Phys. Soc. Jpn69 3425 - 3428 2000年査読
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M. Yoshida, K. Koyama, T. Sakon, A. Ochiai and M. Motokawa . Cyclotron resonance of LaSb . J. Phys. Soc. Jpn.69 3629 - 3632 2000年査読
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K. Koyama, M. Yoshida, H. Nojiri, T. Sakon, D.X. Li, T. Suzuki and M. Motokawa . Antiferromagnetic resonance and magnetic structure of GdAs . J. Phys. Soc. Jpn.69 1521 - 1525 2000年査読
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H. Kato, M. Ishizone, T. Miyazaki, K. Koyama, H. Nojiri and M. Motokawa . Fabrication and magnetic properties of nanophase dispersed Nd2Fe14B / α-Fe and Sm2Fe17N3 / α-Fe films with crystallite orientation of hard phases . proceedings for Sixteenth International Workshop on Rare-Earth Magnets (Sendai 2000) 547 - 549 2000年査読
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T. Sakon, H. Nojiri, K. Koyama, T. Asano, Y. Ajiro and M. Motokawa . ESR at ultra-low temperatures and observation of new mode in Cu-Benzoate . proceedings for EPR in the 21st century (Kobe 2000) 807 - 812 2000年査読
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Sakon Takuo, Nakanishi Yoshiki, Yoshida Makoto, Koyama Keiichi, Takahashi Fumihiko, Nojiri Hiroyuki, Li De Xin, Suzuki Takashi, Motokawa Mitsuhiro . dHvA Effect and Magnetic Resonance of GdAs . JJAP Series: Physics of Strongly Correlated Electron Systems11 135 - 137 1999年12月
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UMEO Kazunori, TAKABATAKE Toshiro, PIETRUS Thomas, LOHNEYSEN Hilbert von, OHMOTO Hirohisa, KOYAMA Keiichi, HANE Shogo, GOTO Tsuneaki . Pressure-Induced Quantum Phase Transition in Ce_7Ni_3 . JJAP series11 154 - 156 1999年2月
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H. Fujii, K. Koyama, I. Sasaki, S. Mitsudo and M. Motokawa . Giant magnetic anisotropy in Sm2Fe17 induced by nitrogenation . J. Magn. Soc. Jpn.23 465 - 467 1999年1月査読
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T. Sakon, Y. Nakanishi, M. Yoshida, K. Koyama, F. Takahashi, H. Nojiri, D. Li, T. Suzuki and M. Motokawa . dHvA effect and magnetic resonance of GdAs . Physics of strongly correlated electron systems, ed. T. Komatsubara, H. Fujii, Y. Onuki and H. Shiba (Japanese Journal of Applied Physics, Tokyo) 135 - 137 1999年1月
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K. Koyama, T. Goto, H. Fujii, H. Fukuda and Y. Janssen . Magnetization measurements of Ce2Fe17 under high pressure and high magnetic fields . J. Magn. Soc. Jpn.23 471 - 473 1999年査読
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N. Suzuki, T. Kanomata, R. Konno, T. Kaneko, H. Yamauchi, K. Koyama, H. Nojiri, Y. Yamaguchi and M. Motokawa . Magnetic Phase diagram of CrTe1-xSbx (0.0 ?x ?1.0) . J. Alloys and Compounds290 25 - 29 1999年査読
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K. Koyama, T. Goto, T. Kanomata and R. Note . Precise magnetization measurements of single-crystalline FeSi under high pressure . J. Phys. Soc. Jpn. 68 1693 - 1698 1999年査読
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K. Koyama, H. Fujii, Y. Makihara, T. Kajitani and Morii . Thermal expansion measurements on rhombohedral Y2Fe17 and Y2Fe17N3.1 . J. Magn. Soc. Jpn.23 468 - 470 1999年査読
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K. Umeo, T. Takabatake, T. Pietrus, H. B. Lohneysen, H. Ohmoto, K. Koyama, S. Hane and T. Goto . Pressure-induced quantum phase transition in Ce7Ni3 . Physics of strongly correlated electron systems, ed. T. Komatsubara, H. Fujii, Y. Onuki and H. Shiba (Japanese Journal of Applied Physics, Tokyo) 154 - 156 1999年
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N. Suzuki, T. Kanomata, R. Konno, T. Kaneko, H. Yamauchi, K. Koyama, H. Nojiri, Y. Yamaguchi, M. Motokawa . Magnetic phase diagram of CrTe<inf>1-x</inf>Sb<inf>x</inf> (0.0≤x≤1.0) . Journal of Alloys and Compounds290 ( 1-2 ) 25 - 29 1999年
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小山 佳一, 藤井 博信, 光藤 誠太郎, 本河 光博, 香島 純, 安藤 由和, CANFIELD P.C. . 窒素侵入型化合物Nd_2Fe_<17>N_3単結晶の磁気異方性 . 日本応用磁気学会誌22 ( 4 ) 345 - 348 1998年4月査読
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T Kamimori, K Koyama, Y Mori, M Asano, K Kinoshita, J Mochimaru, K Konishi, H Tange . Preferential site occupation of M atoms and the Curie temperature in Y2Fe17-xMx (M = Al, Si, Ga) . JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS177 ( Pt.2 ) 1119 - 1120 1998年1月査読
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K. Koyama, S. Hane, K. Kamishima and T. Goto . Instrument for high resolution magnetization measurements at high pressures, high magnetic fields and low temperatures . Rev. Sci. Instrum.69 3009 - 3014 1998年査読
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T. Kamimori, K. Koyama, Y. Mori, M Asano, K. Kinoshita, J. Mochimaru, K. Konishi and H. Tange, . Preferential site occupation of N atoms and the Curie temperature in Y2Fe17-xMx (M=Al, Si, Ga) . J. Magn. Magn. Mater.177-181 1119 - 1120 1998年査読
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K. Koyama, T. Goto, H. Fujii, N. Takeshita, N. Mori, H. Fukuda and Y. Janssen . Observation of new magnetic phases in Ce2Fe17 under high pressure and high magnetic fields . J. Phys. Soc. Jpn.67 1879 - 1882 1998年査読
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K. Umeo, T. Takabatake, H. Ohmoto, T. Pietrus, H. B. Lohneysen, K. Koyama, S. Hane and T. Goto . Low-temperature specific heat and magnetic susceptibility near the pressure-induced quantum phase transition in Ce7Ni3 . Phys. Rev. B58 12095 - 12099 1998年査読
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小山佳一、藤井博信、光藤誠太郎、本河光博、香嶋純、安藤由和、P.C. Canfield . 窒素侵入型化合物Nd2Fe17N3 単結晶の磁気異方性 . 日本応用磁気学会誌22 345 - 348 1998年査読
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K. Koyama, T. Kajitani, Y. Morii, H. Fujii, M. Akayama . Neutron powder diffraction of rhombohedral Y2Fe17 and Y2Fe17N3.1 . Physical Review B55 ( 17 ) 11414 - 11421 1997年5月査読
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K. Koyama, T. Kajitani, Y. Morii, H. Fujii and M. Akayama . Neutron powder diffraction of rhombohedral Y2Fe17 and Y2Fe17N3.1 . Phys. Rev. B55 11414 - 11421 1997年査読
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K. Koyama, H. Fujii, S. Mitsudo, M. Motokawa, J. Koujima, Y. Andoh and P.C. Canfield . High-field magnetization on interstitially modified single crystals Nd2Fe17Z3 (Z=H and N) . Physica B237-238 548 - 550 1997年査読
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H. Fujii, K. Koyama, K. Tatami, S. Mitsudo, M. Motokawa, T. Kajitani, Y. Morii and P.C. Canfield . Recent development of basic magnetism in interstitially-modified rare earth iron nitrides R2Fe17N3 . Recent development of basic magnetism in interstitially-modified rare earth iron nitrides R2Fe17N3237-238 534 - 540 1997年査読
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K. Koyama, H. Fujii, S. Suzuki . Magnetic properties of interstitially modified compounds Sm3(Fe,M)29Zx (M Ti, V, Cr and Z H or N) . Journal of Magnetism and Magnetic Materials161 118 - 126 1996年8月査読
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K. Koyama, H. Fujii, P.C. Canfield . Magnetocrystalline anisotropy of a Nd2Fe17 single crystal . Physica B: Condensed Matter226 ( 4 ) 363 - 369 1996年8月査読
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H. Fujii, K. Tatami, K. Koyama . Nitrogenation process in Sm2Fe17 under various N2-gas pressures up to 6 MPa . Journal of Alloys and Compounds236 ( 1-2 ) 156 - 164 1996年4月査読
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K. Koyama, H. Fujii and S. Suzuki . Magnetic properties of interstitially modified compounds Sm3(Fe,M)29Zx (M=Ti, V, Cr and Z=H or N) . J. Magn. Magn. Mater.161 118 - 126 1996年査読
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H. Fujii, K. Tatami and K. Koyama . Nitrogenation process in Sm2Fe17 under various pressures up to 6 MPa . J. Alloys and Compounds236 156 - 164 1996年査読
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K. Koyama, H. Fujii and P.C. Canfield . Magnetocrystalline anisotropy of Nd2Fe17 single crystal . Physica B226 363 - 369 1996年査読
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K. Koyama, Y. Mori, M. Asano, T. Kamimori, H. Tange and M. Goto . Effect of nitrogenation on magnetism for Y2Fe17-x(Si,Al)x . J. Magn. Magn. Mater.140-144 969 - 970 1995年査読
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T. Kamimori, K. Koyama and M. Goto . Magnetocrystalline anisotropy of Y2Fe17 with silicon and carbon . Nuclear Instruments and Methods in Physics Research B76 57 - 58 1993年査読