State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200443, China.
Phys Rev Lett. 2013 Aug 9;111(6):067203. doi: 10.1103/PhysRevLett.111.067203. Epub 2013 Aug 8.
We study the Skyrmion dynamics in thin films under a temperature gradient. Our numerical simulations show that both single and multiple Skyrmions in a crystal move towards the high temperature region, which is contrary to particle diffusion. Noticing a similar effect in the domain wall motion, we employ a theory based on magnon dynamics to explain this counterintuitive phenomenon. Unlike the temperature driven domain wall motion, the Skyrmion's topological charge plays an important role, and a transverse Skyrmion motion is observed. Our theory turns out to be in agreement with numerical simulations, both qualitatively and quantitatively. Our calculation indicates that a very promising Skyrmion dynamic phenomenon can be observed in experiments.
我们研究了温度梯度下薄膜中的斯格明子动力学。我们的数值模拟表明，晶体中的单个和多个斯格明子都朝着高温区域移动，这与粒子扩散相反。在畴壁运动中注意到类似的效应，我们采用基于磁振子动力学的理论来解释这种违反直觉的现象。与温度驱动的畴壁运动不同，斯格明子的拓扑电荷起着重要作用，并且观察到横向斯格明子运动。我们的理论在定性和定量上都与数值模拟结果一致。我们的计算表明，实验中可以观察到一种非常有前景的斯格明子动力学现象。
