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arXiv 1808.01436cond-mat.mes-hall
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自旋转移矩作用下铁磁体中手征Skyrmion的自振荡

Chiral skyrmion auto-oscillations in a ferromagnet under spin transfer torque

Naveen Sisodia, Stavros Komineas, Pranaba Kishor Muduli

摘要:

在具有Dzyaloshinskiii-Moriya(DM)相互作用的铁磁材料中,Skyrmion可以稳定在纳米盘几何形状中。我们应用自旋力矩均匀的空间和时间,并观察到数值的skyrmion设置在稳定的旋转运动围绕一个点的纳米盘中心。我们给出了一个理论描述的新兴的自动振荡动力学的基础上的旋转运动的呼吸模式的skyrmion和相关的振荡的面内磁化耦合。分析表明,在这种简单的装置中,自振荡的实现是由于手征对称性破缺。因此,我们认为,该系统是变成一个自旋力矩振子由于手征DM相互作用。

英文摘要:

A skyrmion can be stabilized in a nanodisc geometry in a ferromagnetic material with Dzyaloshinskii-Moriya (DM) interaction. We apply spin torque uniform in space and time and observe numerically that the skyrmion is set in steady rotational motion around a point off the nanodisc center. We give a theoretical description of the emerging auto-oscillation dynamics based on the coupling of the rotational motion to the breathing mode of the skyrmion and to the associated oscillations of the in-plane magnetization. The analysis shows that the achievement of auto-oscillations in this simple set-up is due to the chiral symmetry breaking. Thus, we argue that the system is turned into a spin-torque oscillator due to the chiral DM interaction.

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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