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Interaction of a Magnetic Vortex with Magnetic Anisotropy Nonuniformity
Journal of Experimental and Theoretical Physics ( IF 1.1 ) Pub Date : 2020-12-02 , DOI: 10.1134/s1063776120090071
V. A. Orlov , G. S. Patrin , I. N. Orlova

Abstract

The problem of propagation of a magnetic inhomogeneity in the form of a magnetic vortex near a defect simulated by a crystallite with uniaxial anisotropy has been solved theoretically. The defect (crystallite) is implanted into a homogeneous 2D ferromagnetic matrix. Apart from the anisotropy energy, the term responsible for the existence of a centrosymmetric potential is included into the total energy. For calculations, we have used the method of collective variables (Thiele equation). We have considered the variants of bidirectional and unidirectional anisotropy of the crystallite. Analysis of the equations of motion for different directions of the anisotropy axis of the implanted defect has revealed the variety in the behavior of the vortex core as a quasiparticle. The vortex core can be trapped by the defect with equilibrium position of the vortex at rest directly on the crystallite or during its motion at a certain distance from it. It is shown that for a small damping parameter and in the case when the defect anisotropy axis lies in the plane of the magnet, the vortex moves so as if its core experiences the action of the repulsive axially symmetric potential.



中文翻译:

磁涡旋与磁各向异性非均匀性的相互作用

摘要

理论上已经解决了由具有单轴各向异性的微晶模拟的缺陷附近的以磁涡旋形式传播的磁不均匀性的问题。缺陷(微晶)被植入到均匀的二维铁磁基体中。除了各向异性能,负责中心对称电位存在的术语也包括在总能量中。为了进行计算,我们使用了集体变量的方法(Thiele方程)。我们已经考虑了晶体的双向和单向各向异性的变体。对植入缺陷的各向异性轴的不同方向的运动方程的分析表明,作为准粒子的涡流核的行为各不相同。涡流核可被缺陷捕获,涡流的平衡位置直接位于微晶上,或者在其运动过程中处于一定距离。结果表明,对于较小的阻尼参数,并且当缺陷各向异性轴位于磁体平面内时,涡流会移动,好像其核心受到排斥的轴向对称电位的作用一样。

更新日期:2020-12-02
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