Theoretical study on dynamics of topological magnets

在我最初对2021财年的提议中，我计划继续我在(1)Skyrmions的三维纹理以及(2)热激活标量自旋手性对原子晶格的影响方面的合作。此外，我计划研究温度和温度梯度对Skyrmions运动的影响，以支持最近在RIKEN的实验结果。在(1)的末尾，我研究了各种不同的主题，利用了我的开源模拟工具MuMax3的修改版本的计算能力。我可以解释对手性磁体螺旋(片层)相中拓扑缺陷的不同寻常的实验观察，在另一个项目中，我可以解释在实验中绘制的一系列不同材料组成中的Skyrmions和antiSkyrmions的稳定性。此外，一项关于钉扎在缺陷处的Skyrmions的电流感应失真的工作正在进行中，还有一项关于磁螺杆运动引起的电流和自旋电流的工作正在进行中。我们第一次关于(2)诱导的大霍尔效应和能斯特效应的工作也已经发表，并启动了后续的项目。最后，我还尝试了以前的理论中描述的天子在温度梯度中的运动，但不能解释在RIKEN的实验观测。我修正了以前这些理论中的小误差，并将结果与误差补偿理论相结合，最后描述了实验。

In my original proposal for the fiscal year 2021, I planned to continue my collaborations on (1)the three-dimensional texture of skyrmions as well as the collaborations on (2)the effects of thermally activated scalar spin chirality on atomic lattices. Moreover, I planned to study the effects of temperature and temperature gradients on the motion of skyrmions, supporting recent experimental results at RIKEN.On the end of (1), I have worked on various different topics, exploiting the computational power of my modified version of the open source simulation tool MuMax3. I could explain the unusual experimental observations at topological defects in the helical (lamellar) phase of chiral magnets and, in a different project, explain the stability of skyrmions and antiskyrmions in an experimentally mapped out series of various material compositions. Moreover, a work on the current-induced distortion of skyrmions pinned at defects is under review, as well as a work on the electrical and spin currents induced by the motion of a magnetic screw.Our first work on the large Hall and Nernst effects induced by (2) has also been published and subsequent projects were initiated. However, my program for simulating the thermal Hall effect in such systems is not ready for use yet.Finally, I also tried the motion of skyrmions in temperature gradient which was described in previous theories which,but failed to explain experimental observations at RIKEN.I corrected small errors in these previous and combined the results with a compensate theory for error, which finally described the experiments.