MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
 
Magnetoresistance and Transformation Hysteresis in the Ni50Mn34.4In15.6 Metamagnetic Shape Memory Alloy
Rie Y. UmetsuKeita EndoAkihiro KondoKoichi KindoWataru ItoXiao XuTakeshi KanomataRyosuke Kainuma
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2013 Volume 54 Issue 3 Pages 291-296

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Abstract

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.

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© 2013 The Japan Institute of Metals and Materials
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