研究者詳細 - 小山　佳一

論文 - 小山　佳一

分割表示 496 件中 41 - 60 件目／全件表示 >>

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

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

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

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

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

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

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AIP Advances

The magnetic properties of Mn1-xTMxAlGe (TM = V, Fe and Cu) were investigated for x ≤ 0.2. The spontaneous magnetization decreased with increasing x. A remarkable decrease in the Curie temperature TC was observed for TM = Fe. For ferromagnetic MnAlGe (x = 0) and TM = nonmagnetic Cu (x = 0.2), Curie-Weiss law was confirmed. The compounds with TM = V and Fe (x = 0.2) did not show Curie-Weiss law, and the data of reciprocal susceptibility vs. temperature bent, indicating change of the magnetism from ferromagnetism. Obtained results suggested that the magnetic moments of V and Fe were aligned antiparallel to those of Mn, resulting in the ferrimagnetism-like behavior.

DOI： 10.1063/1.5043069

Scopus

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

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

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

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

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Magnetism and Magnetic Materials

The magnetic and structural properties of Mn1−xCrxAlGe (0 ≤ x ≤ 1.0) compounds were investigated. The spontaneous magnetization Ms and Curie temperature TC of Mn1−xCrxAlGe has a cusp at x = 0.2. The maximum values of Ms and TC are 1.74 μB/f.u. and 601 K, respectively. It was found that the tetragonal Cu2Sb-type structure was stable for 0 ≤ x ≤ 0.75, whereas orthorhombic TiSi2-type structure was observed for x ≥ 0.8. The reciprocal susceptibility as a function of temperature suggested that the magnetic moment of Cr is antiferromagnetically coupled with that of Mn in Cu2Sb-type structure.

DOI： 10.1016/j.jmmm.2018.02.022

Web of Science

Scopus

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

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Journal of Physics: Conference Series

Fe2MnSi exhibits a ferromagnetic transition at TC and another transition to a phase with antiferromagnetic components at a low temperature of TA . By substituting V for Mn, so as to obtain Fe2Mn1-xV x Si, TA decreases with x and then vanishes around x ∼ 0.2. In this study, the magnetic transitions are investigated by magnetization measurements for Fe2Mn1-xV x Si (y = 1, 0 ≤ x ≤ 0.2) in high magnetic fields up to ∼70 T and for Fe1.5(Mn1-xV x )1.5Si (y = 1.5, 0 ≤ x ≤ 0.1) up to 5 T. For y = 1.5, with increasing x, TC increases and TA decreases as for y = 1, and the rate of the decrease in TA with x is slightly smaller than for y=1. In the low magnetic field region, TA for y = 1 does not significantly change due to the magnetic field but a distinct decrease is observed in high fields. The critical field at 0 K of this transition in Fe2MnSi is found to be larger than 70 T, and with increasing x, the critical field decreases corresponding to the decrease of TA at zero field.

DOI： 10.1088/1742-6596/969/1/012099

Scopus

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Physical Society of Japan

The Pressure effect on the magnetic properties of the weak itinerant electron ferromagnet CrAlGe was investigated at pressures up to 1.0 GPa. The spontaneous magnetic moment ps and Curie temperature TC decreased with increasing applied pressure P. The pressure derivatives of ps and TC were dps=dP = -3.98 × 10-5 μB=MPa and dTC=dP = -6.58 × 10-3K=MPa, respectively. These obtained results are discussed on the basis of Takahashi's spin fluctuation theory for weak itinerant electron ferromagnets. The characteristic parameters T0 and TA increased with pressure.

DOI： 10.7566/JPSJ.87.014701

Web of Science

Scopus

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

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

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

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

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

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

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

　前のページ - 次のページ　

<小山 佳一>

論文 - 小山 佳一

<小山　佳一>

論文 - 小山　佳一