arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1803.00534cond-mat.mes-hallcond-mat.mtrl-sci
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自旋-轨道力矩作用下Skyrmion和AntiSkyrmion动力学中的余摆线运动和偶产生

Trochoidal motion and pair generation in skyrmion and antiskyrmion dynamics under spin-orbit torques

Ulrike Ritzmann, Stephan von Malottki, Joo-Von Kim, Stefan Heinze, Jairo Sinova, Bertrand Dupé

摘要:

磁性磁膜中的斯基尔米子和反斯基尔米子的特征是描述自旋如何围绕其核心缠绕的拓扑电荷。该拓扑控制它们对刚性核心限制中的力的响应。然而,当内部核心激励相关时,动力学变得更加丰富。我们表明,电流引起的自旋轨道力矩可以导致的现象,如余摆线运动和skyrmion-antiskyrmion对生成,只发生在skyrmion或antiskyrmion,这取决于对称性的基础Dzyaloshinskiii-Moriya相互作用。这样的动力学是由核心变形引起的,导致了一个依赖于时间的螺旋度,它控制着Skyrmion和antiskyrmion核心的运动。我们通过原子自旋模拟,减少变量建模和机器学习算法的组合来计算动力学相图。它预测了自旋轨道力矩如何控制运动的类型以及通过反skyrmion播种产生skyrmion晶格的可能性。

英文摘要:

Skyrmions and antiskyrmions in magnetic ultrathin films are characterised by a topological charge describing how the spins wind around their core. This topology governs their response to forces in the rigid core limit. However, when internal core excitations are relevant, the dynamics become far richer. We show that current-induced spin-orbit torques can lead to phenomena such as trochoidal motion and skyrmion-antiskyrmion pair generation that only occurs for either the skyrmion or antiskyrmion, depending on the symmetry of the underlying Dzyaloshinskii-Moriya interaction. Such dynamics are induced by core deformations, leading to a time-dependent helicity that governs the motion of the skyrmion and antiskyrmion core. We compute the dynamical phase diagram through a combination of atomistic spin simulations, reduced-variable modelling, and machine learning algorithms. It predicts how spin-orbit torques can control the type of motion and the possibility to generate skyrmion lattices by antiskyrmion seeding.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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