Hysteresis loops of magnetic thin films with perpendicular anisotropy
Hysteresis loops of magnetic thin films with perpendicular anisotropy
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DOI：
10.1103/physrevb.72.094406
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发表时间：
2005-09-01
影响因子：
3.7
通讯作者：
Jagla, EA
中科院分区：
文献类型：
--
作者：
Jagla, EA
我们模拟了具有易垂直（z）轴各向异性的准二维系统在外部磁场沿着z变化时的磁化强度。该模型是标量“φ-四分之一”模型的推广，该模型仅考虑磁化的z分量，并且包括磁交换、偶极相互作用、结构无序和外部z取向磁场。在无序/相互作用强度平面的相图，并分析了不同的定性制度，主要集中在磁化反转过程中的突然成核步骤的存在与否。结果比较非常好，与观察到的实验磁滞回线和空间磁化模式，例如在情况下的Co-Pt多层膜。
We model the magnetization of quasi-two-dimensional systems with easy perpendicular (z) axis anisotropy upon change of the external magnetic field along z. The model is a generalization of the scalar "phi-fourth" model that considers only the z component of the magnetization, and includes magnetic exchange, dipolar interactions, structural disorder, and an external z-oriented magnetic field. The phase diagram in the disorder/interaction strength plane is presented, and the different qualitative regimes are analyzed, mainly focusing on the existence or not of an abrupt nucleation step in the process of magnetization reversal. The results compare very well with observed experimental hysteresis loops and spatial magnetization patterns, as for instance in the case of Co-Pt multilayers.