arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.00898cond-mat.mes-hallphysics.app-ph
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反铁磁体中磁振子驱动的Skyrmion动力学:磁振子极化效应

Magnon driven skyrmion dynamics in antiferromagnets: The effect of magnon polarization

Z. Jin, C. Y. Meng, T. T. Liu, D. Y. Chen, Z. Fan, M. Zeng, X. B. Lu, X. S. Gao, M. H. Qin, J. M. Liu

摘要:

可控磁Skyrmion运动是制备先进Skyrmion基自旋电子器件中备受关注的问题。具体地,磁振子驱动的skyrmion运动可以在金属和绝缘磁体中容易地获得,并且因此相对于电流控制而言是高度优选的,进一步用于超低能耗。本文利用集体坐标理论,研究了反铁磁体中由磁振子驱动的Skyrmion运动的动力学,着重讨论了磁振子极化的影响。结果表明,由圆极化磁振子驱动的Skyrmion Hall运动在一般情况下是不可避免的,这与以前的报道是一致的。此外,弹性散射理论和数值结果揭示了线极化磁振子和skyrmion运动之间的强相关性,暗示skyrmion运动对驱动磁振子极化性质的复杂依赖性.在反转过程中,来自运动Skyrmion的散射可能导致线极化磁振子分解为两个椭圆极化磁振子带。因此,由于镜像对称性破缺,作用在Skyrmion上的净横向力产生,这反过来又驱动Skyrmion Hall运动。只有在保持镜像对称性的特定条件下,霍尔运动才能被完全抑制。本工作揭示了反铁磁体中非平凡的斯基尔米恩-磁振子散射行为,推进了反铁磁自旋电子学的发展,有利于高性能器件的研制。

英文摘要:

The controllable magnetic skyrmion motion represents a highly concerned issue in preparing advanced skyrmion-based spintronic devices. Specifically, magnon-driven skyrmion motion can be easily accessible in both metallic and insulating magnets, and thus is highly preferred over electric current control further for the ultra-low energy consumption. In this work, we investigate extensively the dynamics of skyrmion motion driven by magnon in an antiferromagnet using the collective coordinate theory, focusing on the effect of magnon polarization. It is revealed that the skyrmion Hall motion driven by circularly polarized magnon becomes inevitable generally, consistent with earlier report. Furthermore, the elastic scattering theory and numerical results unveil the strong inter-dependence between the linearly polarized magnon and skyrmion motion, suggesting the complicated dependence of the skyrmion motion on the polarization nature of driving magnon. On the reversal, the scattering from the moving skyrmion may lead to decomposition of the linearly polarized magnon into two elliptically polarized magnon bands. Consequently, a net transverse force acting on skyrmion is generated owing to the broken mirror symmetry, which in turn drives a skyrmion Hall motion. The Hall motion can be completely suppressed only in some specific condition where the mirror symmetry is preserved. The present work unveils non-trivial skyrmion-magnon scattering behavior in antiferromagnets, advancing the antiferromagnetic spintronics and benefiting to high-performance devices.

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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