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首页> 外文期刊>Physica, B. Condensed Matter >3D calculation of hysteresis loops, magnetic orientations and reversal processes for exchange-spring bilayers with perpendicular anisotropy
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3D calculation of hysteresis loops, magnetic orientations and reversal processes for exchange-spring bilayers with perpendicular anisotropy

机译：具有垂直各向异性的交换弹簧双层的磁滞回线，磁取向和反向过程的3D计算

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摘要

Hysteresis loops and magnetic reversal processes have been determined by a three dimensional (3D) micromagnetic model for exchange-coupled Nd _2Fe _(14)B/α-Fe bilayers and carefully compared with a popular one-dimensional (1D) micromagnetic model. It is found that the calculated hysteresis loops, the critical fields and the magnetic phase diagrams agree well with the results given by the 1D model. However, the calculated nucleation mode is a quasi-curling one where the magnetic moment exhibits a curling in the film plane and varies in the thickness direction, in contrast with the reported quasi-coherent mode. The calculated spatial distribution of the magnetization orientation in the thickness direction at various applied fields signifies a three-step magnetic reversal process, which includes nucleation, growth and displacement of the domain wall as well as the rotation and the reversal of magnetization in the hard phase. The magnetic reversal of the hard phase is much slower than that given by the 1D model, leading to a more slant hysteresis loop near the coercivity point.
机译：磁滞回线和磁逆过程已通过三维（3D）微磁模型确定了交换耦合Nd _2Fe _（14）B /α-Fe双层薄膜，并与流行的一维（1D）微磁模型进行了仔细比较。结果发现，计算出的磁滞回线，临界场和磁相图与一维模型给出的结果非常吻合。然而，与所报道的准相干模式相反，所计算的成核模式是准弯曲模式，其中磁矩在膜平面中表现出卷曲并且在厚度方向上变化。在各种施加磁场下，厚度方向的磁化取向的空间分布表示三步磁反转过程，该过程包括磁畴壁的成核，生长和位移以及硬相中磁化的旋转和反转。 。硬相的磁反转比一维模型给出的磁反转慢得多，导致在矫顽点附近的磁滞回线更加倾斜。

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