Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni 50+ x Mn 27- x Ga 23 in Magnetic Fields

Thermal strain, permeability, and magnetization measurements of the ferromagnetic shape memory alloys Ni Mn Ga ( = 2.0, 2.5, 2.7) were performed. For = 2.7, in which the martensite transition and the ferromagnetic transition occur at the same temperature, the martensite transition starting temperatu...

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Published in:Materials 2014-05, Vol.7 (5), p.3715
Main Authors: Sakon, Takuo, Otsuka, Kohei, Matsubayashi, Junpei, Watanabe, Yuushi, Nishihara, Hironori, Sasaki, Kenta, Yamashita, Satoshi, Umetsu, Rie Y, Nojiri, Hiroyuki, Kanomata, Takeshi
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Language:English
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Summary:Thermal strain, permeability, and magnetization measurements of the ferromagnetic shape memory alloys Ni Mn Ga ( = 2.0, 2.5, 2.7) were performed. For = 2.7, in which the martensite transition and the ferromagnetic transition occur at the same temperature, the martensite transition starting temperature shift in magnetic fields around a zero magnetic field was estimated to be d /d = 1.1 ± 0.2 K/T, thus indicating that magnetic fields influences martensite transition. We discussed the itinerant electron magnetism of = 2.0 and 2.5. As for = 2.5, the ⁴ 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.
ISSN:1996-1944
1996-1944