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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 (CC BY 3.0).
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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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