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

Rie Y. Umetsu; Keita Endo; Akihiro Kondo; Koichi Kindo; Wataru Ito; Xiao Xu; Takeshi Kanomata; Ryosuke Kainuma

doi:10.2320/matertrans.M2012365

Magnetoresistance and Transformation Hysteresis in the Ni₅₀Mn_34.4In_15.6 Metamagnetic Shape Memory Alloy

Rie Y. Umetsu, Keita Endo, Akihiro Kondo, Koichi Kindo, Wataru Ito, Xiao Xu, Takeshi Kanomata, Ryosuke Kainuma

Author information

Rie Y. Umetsu
Institute for Materials Research, Tohoku University
Keita Endo
Faculty of Engineering, Tohoku Gakuin University
Department of Materials Science, Graduate School of Engineering, Tohoku University
Akihiro Kondo
Institute for Solid State Physics, The University of Tokyo
Koichi Kindo
Institute for Solid State Physics, The University of Tokyo
Wataru Ito
Department of Materials and Environmental Engineering, Sendai National College of Technology
Xiao Xu
Department of Materials Science, Graduate School of Engineering, Tohoku University
Takeshi Kanomata
Faculty of Engineering, Tohoku Gakuin University
Department of Materials Science, Graduate School of Engineering, Tohoku University
Ryosuke Kainuma
Department of Materials Science, Graduate School of Engineering, Tohoku University

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

JOURNAL FREE ACCESS

2013 Volume 54 Issue 3 Pages 291-296

DOI https://doi.org/10.2320/matertrans.M2012365

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Abstract

Temperature dependence of the equilibrium transformation field (H₀) for Ni₅₀Mn_34.4In_15.6 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.

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