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采用了Monte-Carlo方法,讨论了反铁磁层中不同非磁性掺杂浓度下,铁磁/反铁磁双层膜中交换偏置的温度特性.模拟结果显示:反铁磁层中非磁性掺杂能导致铁磁/反铁磁双层膜中交换偏置的增强.同时,交换偏置随非磁性掺杂浓度的变化存在极大值,即同一温度下交换偏置随掺杂浓度的变化是非单调的.并且,随着温度的升高交换偏置的最大值所对应的掺杂浓度向浓度低的方向移动.它和HongJung-Il等人的实验结果完全一致.究其原因在于反铁磁层相应的自旋排布、磁畴结构等随掺杂浓度的改变发生大的变化,当其正向磁畴和负向磁畴都形成连通的网络结构时,系统的交换偏置达最大.比较了随机掺杂与规则掺杂的模拟结果.模拟结果表明规则掺杂能够获得比随机掺杂更大的交换偏置,进一步表明了铁磁/反铁磁双层膜中交换偏置的特性与铁磁/反铁磁界面磁畴结构密切相关.
The Monte-Carlo method is used to discuss the temperature characteristics of the exchange bias in the ferromagnetic / antiferromagnetic bilayers at different non-magnetic doping concentrations in the antiferromagnetic layer. The simulation results show that the non-magnetic The doping can lead to the enhancement of the exchange bias in the ferromagnetic / antiferromagnetic bilayer membrane.At the same time, the excursion bias has a maximum with the change of the nonmagnetic doping concentration, that is, the exchange bias with the doping concentration The change is non-monotonic, and as the temperature increases, the doping concentration corresponding to the maximum value of the exchange bias moves toward the lower concentration, which is in good agreement with the experimental result of HongJung-Il et al. The corresponding spin arrangement and magnetic domain structure of the ferromagnetic layer change greatly with the change of the doping concentration. When the forward magnetic domain and the negative magnetic domain form a connected network structure, the exchange bias of the system reaches Maximum.The simulation results of random doping and regular doping are compared.The simulation results show that the regular doping can get a larger exchange bias than the random doping and further indicate the exchange bias in the ferromagnetic / Is closely related to the magnetic domain structure of the ferromagnetic / antiferromagnetic interface.