Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni50+xMn27−xGa23 in Magnetic Fields

Takuo Sakon; Kohei Otsuka; Junpei Matsubayashi; Yuushi Watanabe; Hironori Nishihara; Kenta Sasaki; Satoshi Yamashita; Rie Y. Umetsu; Hiroyuki Nojiri; Takeshi Kanomata

doi:10.3390/ma7053715

Materials (May 2014)

Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni50+xMn27−xGa23 in Magnetic Fields

Takuo Sakon,
Kohei Otsuka,
Junpei Matsubayashi,
Yuushi Watanabe,
Hironori Nishihara,
Kenta Sasaki,
Satoshi Yamashita,
Rie Y. Umetsu,
Hiroyuki Nojiri,
Takeshi Kanomata

Affiliations

Takuo Sakon: Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan
Kohei Otsuka: Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan
Junpei Matsubayashi: Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan
Yuushi Watanabe: Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan
Hironori Nishihara: Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan
Kenta Sasaki: Department of Mechanical Engineering, Graduate School of Engineering and Resource Science, Akita University, Akita 010-8502, Japan
Satoshi Yamashita: Faculty of Engineering, Tohoku Gakuin University, Tagajo 985-8537, Japan
Rie Y. Umetsu: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Hiroyuki Nojiri: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Takeshi Kanomata: Research Institute for Engineering and Technology, Tohoku Gakuin University, Tagajo 985-8537, Japan

DOI: https://doi.org/10.3390/ma7053715
Journal volume & issue: Vol. 7, no. 5
pp. 3715 – 3734

Abstract

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Thermal strain, permeability, and magnetization measurements of the ferromagnetic shape memory alloys Ni50+xMn27−xGa23 (x = 2.0, 2.5, 2.7) were performed. For x = 2.7, in which the martensite transition and the ferromagnetic transition occur at the same temperature, the martensite transition starting temperature TMs shift in magnetic fields around a zero magnetic field was estimated to be dTMs/dB = 1.1 ± 0.2 K/T, thus indicating that magnetic fields influences martensite transition. We discussed the itinerant electron magnetism of x = 2.0 and 2.5. As for x = 2.5, the M4 vs. B/M plot crosses the origin of the coordinate axis at the Curie temperature, and the plot indicates a good linear relation behavior around the Curie temperature. The result is in agreement with the theory by Takahashi, concerning itinerant electron ferromagnets.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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