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首页> 外文期刊>Physical review >Effect of martensitic transformation and magnetic field on transport properties of Ni-Mn-Ga and Ni-Fe-Ga Heusler alloys
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Effect of martensitic transformation and magnetic field on transport properties of Ni-Mn-Ga and Ni-Fe-Ga Heusler alloys

机译:马氏体相变和磁场对Ni-Mn-Ga和Ni-Fe-Ga Heusler合金输运性能的影响

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摘要

We study the magnetic-field influence on the martensitic transformation temperatures and the accompanying anomaly in the resistivity by extensive measurements of the temperature dependencies of resistivity of several Ni-Mn-Ga and Ni-Fe-Ga alloys. A low-field minimum of the martensitic transformation temperature versus magnetic-field curves is observed for single and polycrystalline Ni-Mn-Ga alloys. This minimum is confirmed by magnetization loop measurements showing a magnetic anisotropy contribution to the ordinary Clausius-Clapeyron relationship which describes the martensitic transformation. This minimum did not appear for Ni-Fe-Ga polycrystalline alloys because in this case the difference in the magnetic anisotropy of relevant phases is small. We did not find any systematic behavior of the magnetoresistance related to the phase in which it is measured. In the vicinity of the martensitic transformation, the magnetoresistance exhibits a peaklike behavior which is explained in terms of the combined influence of the zero-field resistivity anomaly at the transition and the magnetic-field-induced shift of the transformation temperature.
机译:通过广泛测量几种Ni-Mn-Ga和Ni-Fe-Ga合金的电阻率与温度的关系,我们研究了磁场对马氏体转变温度的影响以及随之而来的电阻率异常。对于单晶和多晶Ni-Mn-Ga合金,观察到马氏体转变温度相对于磁场曲线的最低场最小值。该最小值由磁化回路测量结果证实,磁化回路测量结果表明,磁各向异性对描述马氏体相变的普通克劳修斯-克拉珀龙关系有贡献。对于Ni-Fe-Ga多晶合金,没有出现这个最小值,因为在这种情况下,相关相的磁各向异性差异很小。我们没有发现与测量相有关的磁阻的任何系统行为。在马氏体相变附近,磁致电阻表现出峰状行为,这可以通过转变时零场电阻率异常和相变温度的磁场感应位移的综合影响来解释。

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