Symmetry driven irreversibilities at ferromagnetic-antiferromagnetic interfaces
Symmetry driven irreversibilities at ferromagnetic-antiferromagnetic interfaces
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DOI：
10.1103/physrevlett.93.097203
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发表时间：
2004-08-27
影响因子：
8.6
通讯作者：
Hoffmann, A
中科院分区：
文献类型：
--
作者：
Hoffmann, A
铁磁体和反铁磁体之间的耦合可以建立方向各向异性，称为交换偏置。在许多系统中，这种交换偏置在随后的场循环时减小，这被称为训练效应。一个简单的相干旋转模型的数值模拟表明，在反铁磁体的各向异性的对称性是至关重要的交换偏置系统中的培训效果的理解。也就是说，多个反铁磁易各向异性轴的存在最初可以稳定反铁磁自旋的非共线排列，其在铁磁体的第一磁化反转之后弛豫成共线排列。
The coupling between a ferromagnet and an antiferromagnet can establish a directional anisotropy called exchange bias. In many systems this exchange bias is reduced upon subsequent field cycling, which is referred to as training effects. Numerical simulations of a simple coherent rotation model suggest that the symmetry of the anisotropy in the antiferromagnet is crucial for the understanding of training effects in exchange bias systems. Namely, the existence of multiple antiferromagnetic easy anisotropy axes can initially stabilize a noncollinear arrangement of the antiferromagnetic spins, which relaxes into a collinear arrangement after the first magnetization reversal of the ferromagnet.