(华东交通大学 基础科学学院，南昌 330013)
摘 要: 微磁学理论为基础，采用三维动力学模型研究了Sm-Co/α-Fe双层膜的内禀矫顽力与外场取向的关系，以预测交换耦合双层膜(硬磁层和软磁层)磁性体系的磁性。结果表明：随外场角度(外磁场方向与硬磁层易轴间的夹角)的增大，内禀矫顽力减小；但当软磁层厚度小于其临界尺寸或软磁层厚度远大于其临界尺寸时，出现局域极小及局域极大现象；外场角度较小时，随软磁层厚度的增加，内禀矫顽力出现一峰值；这表明适当方向的外场有助于获得比较高的内禀矫顽力。采用能垒分析法对此结果进行定性解释。
关键字: 交换耦合双层膜；微磁学；内禀矫顽力；磁场取向
（School of Basic Science, East China Jiaotong Uinversity, Nanchang 330013, China）
Abstract:To forecast the magnetism of hard/soft exchange-coupling bilayers, the relation between the intrinsic coercive field of the bilayers and the angle between orientation of magnetic field and easy axes of hard layer was investigated by using three-dimension dynamic model based on micromagnetic theory. The results show that the intrinsic coercive field decreases with increasing angle. But for the thickness of soft layer smaller than a critical thickness or far larger than the critical thickness, there exist a local minimum at small angle and a local maximum at big angle. For the small angle, with increasing thickness of soft layer, there exists a peak in the calculated intrinsic coercive field curve as a function of soft layer thickness. This indicates that the appropriate magnetic field angle is beneficial to the intrinsic coercive field, and these results are interpreted qualitatively based on the energy-barrier analysis.
Key words: exchange-coupling bilayer; micromagnetic; intrinsic coercive field; magnetic field orientation
