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arXiv 2007.10749cond-mat.mes-hallcond-mat.mtrl-sci
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铁磁薄膜中不对称Skyrmion-Anti-Skyrmion的产生

Asymmetric skyrmion-antiskyrmion production in ultrathin ferromagnetic films

Ulrike Ritzmann, Louise Desplat, Bertrand Dupé, Robert E. Camley, Joo-Von Kim

摘要:

具有受抑交换和Dzyaloshinskiii-Moriya相互作用的超薄铁磁体可以支持拓扑孤子,如skyrmions和反skyrmions,它们是亚稳态的,可以被认为是粒子-反粒子对应物。当自旋轨道力矩被施加时,一个孤立的反克尔米子的运动被驱动超过其沃克极限,可以产生skyrmion-antiskyrmion对。在这里,我们使用原子自旋动力学模拟揭示在这对生成的散射过程。在某些条件下,这些粒子和反粒子的增殖可能会出现增长率和生产不对称性,这取决于手征相互作用的强度和自旋轨道转矩的耗散分量。这些特征在很大程度上是由反克尔米离子之间的散射过程决定的,这些散射过程可以是弹性的,也可以导致束缚态或湮灭。

英文摘要:

Ultrathin ferromagnets with frustrated exchange and the Dzyaloshinskii-Moriya interaction can support topological solitons such as skyrmions and antiskyrmions, which are metastable and can be considered particle-antiparticle counterparts. When spin-orbit torques are applied, the motion of an isolated antiskyrmion driven beyond its Walker limit can generate skyrmion-antiskyrmion pairs. Here, we use atomistic spin dynamics simulations to shed light on the scattering processes involved in this pair generation. Under certain conditions a proliferation of these particles and antiparticles can appear with a growth rate and production asymmetry that depend on the strength of the chiral interactions and the dissipative component of the spin-orbit torques. These features are largely determined by scattering processes between antiskyrmions, which can be elastic or result in bound states or annihilation.

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