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arXiv 2112.04073cond-mat.mes-hallcond-mat.mtrl-sciphysics.app-ph
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形变条件下的Skyrmion动力学

Skyrmion Dynamics in the Presence of Deformation

Zehan Chen, Xichao Zhang, Yan Zhou, Qiming Shao

摘要:

磁skyrmions是一种拓扑自旋织构,有望用于未来的高密度和非易失性存储器。理解存在形变时电流驱动的skyrmion动力学是至关重要的,然而,其分析模型仍然难以捉摸。在这里,我们扩展Thiele的模型,同时考虑径向和切向力。我们的模型将Skyrmion形变归因于电流引起的旋转对称性破缺,其中包括磁化倾斜和畴壁宽度变化。我们的预测skyrmion半径和非线性动力学与微磁学模拟结果是一致的。此外,我们还证明了通过施加面内磁场,可以抑制skyrmion的形变,甚至可以实现skyrmion的压缩。我们的模型提供了一个通用的方法来分析skyrmion变形,并可能启发应用程序的基础上非线性skyrmion动力学。

英文摘要:

Magnetic skyrmions are topological spin textures promising for future high-density and nonvolatile memory. It is crucial to understand the current-driven skyrmion dynamics in the presence of deformation, of which an analytical model, however, remains elusive. Here we extend Thiele's model by considering both the radial and tangential forces. Our model attributes the skyrmion deformation to the current-induced rotational symmetry breaking, which includes magnetization canting and domain wall width variation. Our predictions of skyrmion radius and nonlinear dynamics are consistent with micromagnetic simulation results. Besides, we show that by applying an in-plane magnetic field, the deformation of a skyrmion can be suppressed, and even the compression of a skyrmion can be achieved. Our model provides a generic way to analyze the skyrmion deformation and may inspire applications based on nonlinear skyrmion dynamics.

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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