Materials Transactions Online

Materials Transactions, Vol.54 No.03 (2013) pp.291-296
© 2013 The Japan Institute of Metals

Magnetoresistance and Transformation Hysteresis in the Ni50Mn34.4In15.6 Metamagnetic Shape Memory Alloy

Rie Y. Umetsu1, Keita Endo2, 3, Akihiro Kondo4, Koichi Kindo4, Wataru Ito5, Xiao Xu3, Takeshi Kanomata2, 3 and Ryosuke Kainuma3

1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2Faculty of Engineering, Tohoku Gakuin University, Tagajo 985-8537, Japan
3Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
4Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
5Department of Materials and Environmental Engineering, Sendai National College of Technology, Natori 981-1239, Japan

Temperature dependence of the equilibrium transformation field (H0) for Ni50Mn34.4In15.6 metamagnetic shape memory alloy was precisely determined by electrical resistivity measurements using a pulsed magnet. The H0-T curve was found to exhibit a maximum at around 50 K, suggesting that the transformation entropy change becomes negative in the lower temperature region. The residual electrical resistivity in the field-induced parent phase at lower temperatures was about 10 × 10−8 Ω·m, being normal value as the ferromagnetic alloys, whereas that in the martensite phase was high of about 200 × 10−8 Ω·m. The temperature dependence of the magnetic field hysteresis can be well fitted with the Seeger’s theory proposed for plastic deformation by dislocations.

(Received 2012/11/02; Accepted 2012/12/20; Published 2013/02/25)

Keywords: nickel-based Heusler alloys, metamagnetic shape memory alloy, magnetic field-induced reverse transformation, magnetoresistance effect

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