Magnetic-field-induced transformation in FeMnGa alloys
Magnetic-field-induced transformation in FeMnGa alloys
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DOI：
10.1063/1.3269590
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发表时间：
2009-12
影响因子：
4
通讯作者：
Wen-Huan Zhu;Enke Liu;Lin Feng;Xiaodan Tang;Jizu Chen;Guangheng Wu;H. Liu;F. Meng;H. Luo
中科院分区：
文献类型：
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作者：
Wen-Huan Zhu;Enke Liu;Lin Feng;Xiaodan Tang;Jizu Chen;Guangheng Wu;H. Liu;F. Meng;H. Luo
合成了一种非化学计量比的铁磁形状记忆合金Fe_2MnGa。通过优化组合物，马氏体相变已被修改为发生在约163 K伴随自发磁化，这使得磁场诱导的结构从顺磁性母相转变为铁磁性马氏体，具有93.8 emu/g的高磁化强度。该材料在相变过程中表现出相当大的晶格畸变，（c-a）/c= 33.5%，导致高达3.6%的形状记忆应变。这种大的晶格畸变强烈地影响电子结构，因此研究了与输运和导电性质相关的一些特殊物理行为。
A kind of ferromagnetic shape memory alloy with off-stoichiometric composition of Heusler alloy Fe2MnGa has been synthesized. By optimizing composition, the martensitic transformation has been modified to occur at about 163 K accompanying spontaneous magnetization, which enables a magnetic field-induced structural transition from a paramagnetic parent phase to a ferromagnetic martensite with high magnetization of 93.8 emu/g. The material performs a quite large lattice distortion through the transformation, (c−a)/c=33.5%, causing a shape memory strain upto 3.6%. Such large lattice distortions strongly influence the electron structures, and thus some special physical behavior related to the transport and conductive properties is investigated.