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

1,* email, 1email, 1email, 1email, 1email, 2email, 3email, 4email, 4email and 5,6email
Received: 23 February 2014; in revised form: 2 April 2014 / Accepted: 4 May 2014 / Published: 8 May 2014
(This article belongs to the Special Issue Shape Memory Materials)
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.
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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MDPI and ACS Style

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.

AMA Style

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.

Chicago/Turabian Style

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.

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