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Keiichi Koyama
Keiichi Koyama
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Title
Cited by
Cited by
Year
Observation of large magnetoresistance of magnetic Heusler alloy Ni50Mn36Sn14 in high magnetic fields
K Koyama, H Okada, K Watanabe, T Kanomata, R Kainuma, W Ito, ...
Applied physics letters 89 (18), 2006
2952006
Kinetic arrest of martensitic transformation in the NiCoMnIn metamagnetic shape memory alloy
W Ito, K Ito, RY Umetsu, R Kainuma, K Koyama, K Watanabe, A Fujita, ...
Applied Physics Letters 92 (2), 2008
2592008
Observation of field-induced reverse transformation in ferromagnetic shape memory alloy Ni50Mn36Sn14
K Koyama, K Watanabe, T Kanomata, R Kainuma, K Oikawa, K Ishida
Applied physics letters 88 (13), 2006
2412006
Magnetostriction in Mn3CuN
K Asano, K Koyama, K Takenaka
Applied Physics Letters 92 (16), 2008
2092008
Field-induced martensitic transformation in new ferromagnetic shape memory compound Mn1. 07Co0. 92Ge
K Koyama, M Sakai, T Kanomata, K Watanabe
Japanese journal of applied physics 43 (12R), 8036, 2004
1502004
Anomaly in entropy change between parent and martensite phases in the Ni50Mn34In16 Heusler alloy
RY Umetsu, W Ito, K Ito, K Koyama, A Fujita, K Oikawa, T Kanomata, ...
Scripta Materialia 60 (1), 25-28, 2009
1142009
Direct measurement of large reversible magnetic-field-induced strain in Ni–Co–Mn–In metamagnetic shape memory alloys
JA Monroe, I Karaman, B Basaran, W Ito, RY Umetsu, R Kainuma, ...
Acta Materialia 60 (20), 6883-6891, 2012
972012
Kinetic arrest behavior in martensitic transformation of NiCoMnSn metamagnetic shape memory alloy
RY Umetsu, K Ito, W Ito, K Koyama, T Kanomata, K Ishida, R Kainuma
Journal of Alloys and Compounds 509 (5), 1389-1393, 2011
952011
Observation of an itinerant metamagnetic transition in MnSi under high pressure
K Koyama, T Goto, T Kanomata, R Note
Physical Review B 62 (2), 986, 2000
802000
Magnetic properties of ferromagnetic shape memory alloys Ni2Mn1− xFexGa
D Kikuchi, T Kanomata, Y Yamaguchi, H Nishihara, K Koyama, ...
Journal of alloys and compounds 383 (1-2), 184-188, 2004
762004
Instrument for high resolution magnetization measurements at high pressures, high magnetic fields and low temperatures
K Koyama, S Hane, K Kamishima, T Goto
Review of scientific instruments 69 (8), 3009-3014, 1998
651998
Coercivity enhancements by high-magnetic-field annealing in sintered Nd–Fe–B magnets
H Kato, T Miyazaki, M Sagawa, K Koyama
Applied physics letters 84 (21), 4230-4232, 2004
582004
Magnetic-field-induced enhancement for synthesizing ferromagnetic MnBi phase by solid-state reaction sintering
Y Mitsui, RY Umetsu, K Koyama, K Watanabe
Journal of alloys and compounds 615, 131-134, 2014
502014
Magnetic properties of Co-Cu metastable solid solution alloys
X Fan, T Mashimo, X Huang, T Kagayama, A Chiba, K Koyama, ...
Physical Review B 69 (9), 094432, 2004
492004
Nucleation control for fine nano crystallization of Fe-based amorphous alloy by high-magnetic-field annealing
R Onodera, S Kimura, K Watanabe, Y Yokoyama, A Makino, K Koyama
Journal of Alloys and Compounds 637, 213-218, 2015
482015
Field induced structural transformation in MnAs
F Ishikawa, K Koyama, K Watanabe, H Wada
Japanese journal of applied physics 42 (8A), L918, 2003
482003
Magnetism of a Lu2Fe17H single crystal under pressure
E A. Tereshina, H Yoshida, A V. Andreev, I S. Tereshina, K Koyama, ...
Journal of the Physical Society of Japan 76 (Suppl. A), 82-83, 2007
472007
Precise magnetization measurements of single-crystalline FeSi under high pressure
K Koyama, T Goto, T Kanomata, R Note
Journal of the Physical Society of Japan 68 (5), 1693-1698, 1999
471999
Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields
K Koyama, Y Mitsui, ES Choi, Y Ikehara, EC Palm, K Watanabe
Journal of Alloys and Compounds 509 (5), L78-L80, 2011
462011
Thermodynamic assessment of the Bi-Mn system
K Oikawa, Y Mitsui, K Koyama, K Anzai
Materials Transactions 52 (11), 2032-2039, 2011
452011
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