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arXiv 2203.05342cond-mat.mes-hall
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中心对称晶格中铁磁Skyrmion的坍缩动力学

Dynamics of the collapse of a ferromagnetic skyrmion in a centrosymmetric lattice

A. Derras-Chouk, E. M. Chudnovsky, D. A. Garanin

摘要:

本文用解析和数值方法研究了具有磁场的正方格子海森堡模型中铁磁skyrmion的尺寸和手征随时间的变化。晶格和磁场产生强烈的时间依赖性的Skyrmion手征。由于非线性,晶格本身也会产生强烈的内在阻尼,导致通过自旋波的发射导致Skyrmion坍缩。在没有磁场的情况下,大Skyrmion的坍缩是缓慢的,但当磁场打开时,Landau-Lifshitz阻尼的存在使坍缩变得指数地快。由于Skyrmion磁矩的量子化,坍缩Skyrmion发射的磁振子必须具有离散谱。

英文摘要:

Time dependence of the size and chirality of a ferromagnetic skyrmion in a Heisenberg model with the magnetic field on a square lattice has been studied analytically and numerically. The lattice and the magnetic field generate strong time dependence of the skyrmion chirality. Due to nonlinearity, the lattice alone also generates strong intrinsic damping that leads to the skyrmion collapse via the emission of spin waves. In the absence of the magnetic field the collapse is slow for a large skyrmion but it becomes exponentially fast in the presence of the Landau-Lifshitz damping when the field is turned on. Magnons emitted by a collapsing skyrmion must have a discrete spectrum due to the quantization of the skyrmion magnetic moment.

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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