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Materials 2014, 7(5), 3715-3734; doi:10.3390/ma7053715
Article

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

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1 Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan 2 Department of Mechanical Engineering, Graduate School of Engineering and Resource Science, Akita University, Akita 010-8502, Japan 3 Faculty of Engineering, Tohoku Gakuin University, Tagajo 985-8537, Japan 4 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan 5 Research Institute for Engineering and Technology, Tohoku Gakuin University, Tagajo 985-8537, Japan 6 Department of Materials Research, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
* Author to whom correspondence should be addressed.
Received: 23 February 2014 / Revised: 2 April 2014 / Accepted: 4 May 2014 / Published: 8 May 2014
(This article belongs to the Special Issue Shape Memory Materials)
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Abstract

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.
Keywords: shape memory alloys; thermal strain; magnetization; magnetic properties; magnetic field; itinerant electron ferromagnet shape memory alloys; thermal strain; magnetization; magnetic properties; magnetic field; itinerant electron ferromagnet
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sakon, T.; Otsuka, K.; Matsubayashi, J.; Watanabe, Y.; Nishihara, H.; Sasaki, K.; Yamashita, S.; Umetsu, R.Y.; Nojiri, H.; Kanomata, T. Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni50+xMn27−xGa23 in Magnetic Fields. Materials 2014, 7, 3715-3734.

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