Perpendicular exchange coupling in ferrimagnetic bilayers: An atomistic simulation modelling
Perpendicular exchange coupling in ferrimagnetic bilayers: An atomistic simulation modelling
复制标题
亚铁磁双层中的垂直交换耦合：原子模拟模型
DOI：
10.1016/j.jmmm.2018.05.047
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发表时间：
2018
影响因子：
2.7
通讯作者：
Liu Yaowen
中科院分区：
文献类型：
--
作者：
Fu Zuwei;Zhang Zongzhi;Liu Yaowen
了解垂直交换耦合亚铁磁性材料中的自旋动力学对于信息处理和记录技术的发展具有至关重要的意义。本文用原子水平上的Landau-Lifshitz-Gilbert方程模拟了FeGd/FeTb软/硬双层结构中的垂直界面交换效应。通过将界面交换强度调整为弱耦合、部分耦合和强耦合，确定了三种类型的磁化开关特征。动态模拟进一步验证了这些特征，表明切换的软层也有助于硬层磁化的切换。基于软层和硬层的矫顽力差异，从理论上模拟了垂直左移或右移的交换偏置效应。
Understanding spin dynamics in perpendicular exchange coupled ferrimagnetic materials is an issue of crucial importance for progress in information processing and recording technology. In this paper, the Landau-Lifshitz-Gilbert equation at atomistic-level is employed to model the perpendicular interfacial exchange effect in ferrimagnetic FeGd/FeTb soft/hard bilayer structures. Three types of magnetization switching features are identified by tuning the interfacial exchange strength to be weak coupling, partial coupling, and strong coupling. These features have been further verified by the dynamical simulations, showing the switched soft layer could also help the hard layer magnetization switching. Based on the coercivity difference of the soft layer and hard layer, the left- or right-shift perpendicular exchange bias effect has been theoretically modelled.