TITLE

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

AUTHOR(S)
Takuo Sakon; Kohei Otsuka; Junpei Matsubayashi; Yuushi Watanabe; Hironori Nishihara; Kenta Sasaki; Satoshi Yamashita; Umetsu, Rie Y.; Hiroyuki Nojiri; Takeshi Kanomata
PUB. DATE
September 2014
SOURCE
Materials (1996-1944);Sep2014, Vol. 7 Issue 9, p3715
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
98584646

 

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