Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources; Elected State Key Laboratory; Department of Applied Physics, College of Science, Inner Mongolia University of Science and Technology, Baotou, 014010, China.
College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, 610066, China.
Sci Rep. 2017 Jun 27;7(1):4286. doi: 10.1038/s41598-017-03169-y.
The demagnetization progress of various hard/soft multilayers with perpendicular crystalline anisotropy has been studied by a micromagnetic model, incorporating the effect of the interface anisotropy, which is evident on the nucleation field when the soft layer thickness is small. Both microscopic and macroscopic hysteresis loops as well as angular distributions for the magnetizations in the thickness direction have been calculated, taking into account of realistic values of the interface anisotropy. The formula for the nucleation field has been derived analytically, where the nucleation field increases linearly with the interface anisotropy for a wide thickness region. While the nucleation field could change by more than 90% due to the influence of the interface anisotropy, the interface anisotropy has no effect on the pinning field or the coercivity, but it has some slight influence on the angular distributions. On the other hand, positive interface anisotropy enhances the remanence and the energy products, whereas negative interface anisotropy deteriorates both of them. Comparison with the experimental data justifies our calculation, indicating that negative interface anisotropy should be avoided in the experiment.
通过微磁模型研究了具有垂直各向异性晶体的各种硬/软多层膜的退磁过程，该模型考虑了界面各向异性的影响，当软层厚度较小时，界面各向异性对成核场有明显影响。计算了考虑到界面各向异性的实际值的微观和宏观磁滞回线以及厚度方向的磁化角分布。推导出了成核场的解析公式，其中在较宽的厚度范围内，成核场随界面各向异性线性增加。虽然由于界面各向异性的影响，成核场可能会发生超过 90%的变化，但界面各向异性对钉扎场或矫顽力没有影响，但对角度分布有一些轻微的影响。另一方面，正的界面各向异性增强了剩磁和能量积，而负的界面各向异性则降低了这两者。与实验数据的比较验证了我们的计算，表明在实验中应避免负的界面各向异性。
