Quantitative model of large magnetostrain effect in ferromagnetic shapell memory alloys
Quantitative model of large magnetostrain effect in ferromagnetic shapell memory alloys
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DOI：
10.1007/s100510050128
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发表时间：
2000-03-01
影响因子：
1.6
通讯作者：
Ullakko, K
中科院分区：
文献类型：
--
作者：
Likhachev, AA;Ullakko, K
本文简要报道了几种铁磁形状记忆合金（如Ni2MnGa）中观察到的大磁应变效应的定量模型。这篇论文包含了对类似材料的机械和磁性能的精确热力学考虑。由此，直接由一般麦克斯韦关系导出了包含磁场效应的基本力学状态方程。结果表明，磁场诱导变形效应与磁化强度的应变依赖关系直接相关。本文考虑了一个简单的磁化模型及其与应变的关系，并应用该模型来解释Ni2MnGa中大磁应变效应的实验研究结果。
A quantitative model describing the large magnetostrain effect observed in several ferromagnetic shape memory alloys such as Ni2MnGa is briefly reported. The paper contains an exact thermodynamic consideration of the mechanical and magnetic properties of similar types of materials. As a result, the basic mechanical state equation including magnetic field effect is directly derived from a general Maxwell relation. It is shown that the magnetic field induced deformation effect is directly connected with the strain dependence of magnetization. A simple model of magnetization and its dependence on the strain is considered and applied to explain the results of experimental study of large magnetostrain effects in Ni2MnGa.