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
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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.
Sakon T, Otsuka K, Matsubayashi J, Watanabe Y, Nishihara H, Sasaki K, Yamashita S, Umetsu RY, Nojiri H, Kanomata T. Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni50+xMn27−xGa23 in Magnetic Fields. Materials. 2014; 7(5):3715-3734.
Sakon, Takuo; Otsuka, Kohei; Matsubayashi, Junpei; Watanabe, Yuushi; Nishihara, Hironori; Sasaki, Kenta; Yamashita, Satoshi; Umetsu, Rie Y.; Nojiri, Hiroyuki; Kanomata, Takeshi. 2014. "Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni50+xMn27−xGa23 in Magnetic Fields." Materials 7, no. 5: 3715-3734.