研究者詳細 - 小山　佳一

論文 - 小山　佳一

分割表示 487 件中 101 - 120 件目／全件表示 >>

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

Y. Mitsui, R.Y.Umetsu, K. Koyama, K. Watanabe . Magnetic-field-induced enhancement for synthesizing ferromagnetic MnBi phase by solid-state reaction sintering . J. Alloys. Comp.615 131 - 134 2014年6月査読

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

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

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

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

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

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

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

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

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

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

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

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

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

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

The electronic and magnetic properties of Mn2Sb1-xAsx (where x = 0, 0.5, 1) are investigated from first-principles total-energy calculations. The predicted magnetic ground states (ferrimagnetism for x = 0 and antiferromagnetism for x = 1) are in agreement with experimental observations; however, this is not the case for x = 0.5. Here, it is found that the artificial change of the surrounding atoms of Mn stabilizes the antiferromagnetism. A similar change stabilizes ferrimagnetism (antiferromagnetism) for x = 1 (x = 0). These results indicate that the environment around the Mn atoms plays a very important role in the stabilization of antiferromagnetism in the Mn2Sb1-xAsx system. In addition, an analysis of the sign of an effective exchange interaction as a function of the distance between the Mn atoms is performed.

DOI： 10.2320/matertrans.m2014251

Web of Science

Scopus

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

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：AIP Conference Proceedings

The magnetic field effect (MFE) on liquidus boundary of Bi-Mn binary system was investigated by differential thermal analysis (DTA) and the computer coupling of phase diagram method (CALPHAD). The liquidus boundary for Bi-18at.%Mn and Bi-24at.%Mn rose clearly by the application of the magnetic fields. The MFE for liquidus boundary temperature Tliq changed from ΔTliq∞B2 to ΔTliq∞B because of the large increase of the peritectic temperature from BiMn and BiMn1.08 by the application of magnetic field.

DOI： 10.1063/1.4897725

Web of Science

Scopus

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

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：2014 10th International Vacuum Electron Sources Conference, IVESC 2014 and 2nd International Conference on Emission Electronics, ICEE 2014 - Proceedings

We investigated the structural properties and electrical characteristics of GdTiO3 dielectrics for IGZO TFT devices. We used XRD, XPS, and AFM to examine the structural, compositional, and morphological features of the GdTiO3 film, respectively. The IGZO TFT featuring a GdTiO3 gate dielectric exhibited a large field-effect mobility of 32.3 cm2/V-s, a small threshold voltage of 0.14 V, a high Ion/Ioff current ratio of 4.2 × 108, and a low subthreshold swing of 213 mV/decade.

DOI： 10.1109/IVESC.2014.6891962

Web of Science

Scopus

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

The structural and magnetic properties of Heusler alloy Ni 46Mn41In13 were studied by magnetization and X-ray powder diffraction measurements in the 4.5350K temperature range and in magnetic fields up to 5 T. The alloy undergoes martensitic transformation from a L21-type cubic structure with ac = 0.600nm at 293K to a six-layered monoclinic (6M) structure in the transition temperature of 160230 K. The lattice parameters for the 6M structure were estimated to be am = 0.441 nm, bm = 0.557 nm, cm = 1.30 nm, αm = 90.0°, βm = 94.0°, and γm = 90.0° at 75 K. In this transformation from the L21 to 6M structures, the cell volume contracts by 0.34% at 8K. In addition, we observed the magnetic field-induced reverse transformation of this alloy. © 2014 The Japan Institute of Metals and Materials.

DOI： 10.2320/matertrans.m2013372

Web of Science

Scopus

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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