Magnetic field effect on premartensitic transition in Ni–Mn–Ga alloys
Magnetic field effect on premartensitic transition in Ni–Mn–Ga alloys
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DOI：
10.1063/1.3079677
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发表时间：
2009-02
影响因子：
4
通讯作者：
J. Barandiaran;V. Chernenko;P. Lázpita;J. Gutiérrez;I. Orue;J. Feuchtwanger;S. Besseghini
中科院分区：
文献类型：
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作者：
J. Barandiaran;V. Chernenko;P. Lázpita;J. Gutiérrez;I. Orue;J. Feuchtwanger;S. Besseghini
对恒定磁场下电阻率的温度依赖性的广泛测量使我们有可能弄清成分接近化学计量比的多晶和单晶Ni-Mn-Ga合金的预马氏体相变对高达14T的外加磁场的敏感性。在两种合金的相变温度-磁场曲线上都有一个低场极小值。这一极小值归因于磁各向异性对克劳修斯-克拉佩隆关系的贡献，该关系描述了预马氏体相变。这一贡献通过磁化环的测量得到了证实。
Extensive measurements of the temperature dependencies of resistivity under constant magnetic fields made it possible to clarify the premartensitic transition sensitivity to applied magnetic field up to 14 T in polycrystalline and monocrystalline Ni–Mn–Ga alloys with compositions close to the stoichiometric one. A low-field minimum on the transition temperature versus magnetic field curves is found in both alloys. This minimum is attributed to the magnetic anisotropy contribution to the Clausius–Clapeyron relationship, which describes the premartensitic transition. This contribution is confirmed by magnetization loops measurements.