Theoretical study on dynamics of topological magnets

在我最初的2021财年提案中，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天空运动的影响，以支持RIKEN最近的实验结果。在(1)的末尾，我研究了各种不同的主题，利用了我修改过的开源模拟工具MuMax3的计算能力。我可以解释手性磁体螺旋（片层）相拓扑缺陷的不同寻常的实验观察，并在一个不同的项目中，解释实验绘制的一系列不同材料成分中的skyrmions和anti - skyrmions的稳定性。此外，一项关于固定在缺陷上的skyrmions的电流诱导畸变的工作正在审查中，以及一项关于磁螺杆运动引起的电流和自旋电流的工作正在审查中。我们关于(2)引起的大型霍尔和能斯特效应的第一项工作也已经发表，随后的项目也开始了。然而，我的程序模拟热霍尔效应在这样的系统还没有准备好使用。最后，我还尝试了在温度梯度中天空的运动，这是以前的理论所描述的，但未能解释在理研的实验观察。我修正了之前的小误差，并将结果与误差补偿理论结合起来，最终描述了实验。

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.