Magnetic and magnetocaloric properties of martensitic Ni2Mn1.4Sn0.6 Heusler alloy
Magnetic and magnetocaloric properties of martensitic Ni2Mn1.4Sn0.6 Heusler alloy
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DOI：
10.1016/j.jmmm.2012.02.080
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发表时间：
2012-10
影响因子：
2.7
通讯作者：
V. Chernenko;J. Barandiaran;J. Rodríguez Fernández;D. Rojas;J. Gutiérrez;P. Lázpita;I. Orue
中科院分区：
文献类型：
--
作者：
V. Chernenko;J. Barandiaran;J. Rodríguez Fernández;D. Rojas;J. Gutiérrez;P. Lázpita;I. Orue
研究了马氏体Ni2Mn1.4Sn0.6Heusler合金低温磁性能的演变及磁场对比热随温度变化的影响。频率依赖的阻断温度和相当大的交换偏置低于它的测量在马氏体相。通过对磁场作用下比热曲线的分析，得到了在逆磁结构转变附近，磁场诱导等温磁熵上升和/或磁场诱导绝热温度下降的大的逆磁热效应，以及在居里温度附近的显著的常规磁热效应。德拜温度和电子系数分别为ΘD=310±2K和γ= 16.6±0.3mJ/K ~ 2 mol，与磁场无关。
The evolutions of magnetic properties at low temperatures and the influence of magnetic field on the temperature dependence of specific heat in martensitic Ni2Mn1.4Sn0.6Heusler alloy are studied. The frequency-dependent blocking temperature and considerable exchange bias below it are measured in the martensitic phase. From the analysis of the specific heat curves under magnetic field, a large inverse magnetocaloric effect manifested as the magnetic field induced rise of isothermal magnetic entropy and/or magnetic field induced adiabatic temperature decrease in the vicinity of the reverse magnetostructural transformation and a significant value of the conventional magnetocaloric effect at the Curie temperature are obtained. The Debye temperature and electronic coefficient equal to ΘD=310±2K and γ= 16.6±0.3mJ/K2mol, respectively, do not depend on the magnetic field.