Monte Carlo study of the influence of antiferromagnetic exchange interactions on the phase transitions of ferromagnetic Ni-Mn-X alloys (X=In, Sn, Sb)
Monte Carlo study of the influence of antiferromagnetic exchange interactions on the phase transitions of ferromagnetic Ni-Mn-X alloys (X=In, Sn, Sb)
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DOI：
10.1103/physrevb.78.184427
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发表时间：
2008-11-01
影响因子：
3.7
通讯作者：
Nayak, S. K.
中科院分区：
文献类型：
--
作者：
Buchelnikov, V. D.;Entel, P.;Nayak, S. K.
在用Potts模型哈密顿量进行蒙特卡罗模拟的基础上，我们研究了铁磁性Ni-Mn-X(X=In，Sn，Sb)Heusler合金的磁化强度与温度的复杂关系，其中占据X位的部分锰原子与锰亚晶格上的锰原子发生反铁磁性相互作用。结果表明，这种反铁磁交换导致了Heusler合金的变磁行为和一系列的磁性相变。对于模型哈密顿量参数的最优选择，我们能够描述与耦合马氏体-磁性相变相关的物理。模拟结果与实验磁化曲线及其对温度和成分的依赖关系定性一致。
On the basis of Monte Carlo simulations using the Potts model Hamiltonian, we investigate the complex temperature dependence of magnetization of ferromagnetic Ni-Mn-X (X=In, Sn, Sb) Heusler alloys, in which part of the Mn atoms, which occupy the X sites, interacts antiferromagnetically with the Mn atoms on the Mn sublattice. It is shown that this antiferromagnetic exchange is responsible for metamagnetic behavior and a series of magnetic phase transitions in the Heusler alloys. For an optimal choice of parameters of the model Hamiltonian, which have partially been obtained from ab initio calculations, we are able to describe the physics associated with the coupled martensitic-magnetic phase transition. The simulations lead to a qualitative agreement with the experimental magnetization curves and their dependence on temperature and composition.