Skyrmion Dynamics at Finite Temperatures: Beyond Thiele’s Equation,Physical Review Letters

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Skyrmion Dynamics at Finite Temperatures: Beyond Thiele’s Equation
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-22 , DOI: 10.1103/physrevlett.127.047203
Markus Weißenhofer ₁ , Levente Rózsa ₁ , Ulrich Nowak ₁

Affiliation

Magnetic textures are often treated as quasiparticles following Thiele’s equation of motion. We demonstrate via spin model simulations of the current-driven and Brownian motion of ferromagnetic skyrmions that the existing theory based on Thiele’s equation is insufficient to describe the dynamics of skyrmions at finite temperatures. We propose an extended equation of motion that goes beyond Thiele’s equation by taking into account the coupling of the skyrmion to the magnonic heat bath leading to an additional dissipative term that is linear in temperature. Our results indicate that this so-far-neglected magnon-induced friction dominates for finite temperatures and Gilbert damping values typical for thin films and multilayers.

中文翻译：

有限温度下的 Skyrmion 动力学：超越蒂勒方程

磁性纹理通常被视为遵循蒂勒运动方程的准粒子。我们通过铁磁斯格明子的电流驱动和布朗运动的自旋模型模拟证明，基于蒂勒方程的现有理论不足以描述有限温度下斯格明子的动力学。我们提出了一个扩展的运动方程，该方程超出了蒂勒方程，考虑到斯格明子与磁子热浴的耦合，导致额外的耗散项与温度呈线性关系。我们的结果表明，这种迄今为止被忽略的磁振子引起的摩擦在薄膜和多层膜的典型有限温度和吉尔伯特阻尼值中占主导地位。

更新日期：2021-07-22

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