Manipulation of single skyrmions and skyrmion clusters with electron currents, heat, microwaves, and magnons

本项目的目的是研究在外部刺激下，由高质量大块晶体定义的纳米结构中skyrmions的动力学。我们的策略是使用聚焦离子束技术制备多铁性绝缘体Cu2OSeO3的纳米结构。我们决定从高质量的大块材料开始，因为它已经表明，skyrmion运动很容易在这样的晶体中诱导。然而，我们也打算调查高品质的skyrmion托管薄膜材料内DFG优先program.We提供的其他团体将研究自旋波与手性自旋纹理的skyrmion晶体，skyrmion补丁，和个人skyrmion在纳米结构和薄膜的相互作用。在这里，我们将使用时间分辨的磁光克尔显微镜，微聚焦布里渊光散射，和全电检测研究自旋波的传播和散射的自旋波skyrmion纹理。我们的目标是间接探测skyrmions，并将研究相关的磁振子霍尔效应。同时，我们将进行局部铁磁共振测量双层铁磁体和手征磁体，以确定样品的相图。

The aim of this project is to investigate the dynamics of skyrmions in nanostructures defined from high quality bulk crystals under external stimulus. Our strategy is to prepare nanostructures of the multiferroic insulator Cu2OSeO3 using focused ion beam techniques. We have decided to start from high quality bulk materials since it has been shown that skyrmion motion is easily induced in such crystals. However, we also intend to investigate high quality skyrmion hosting thin film materials provided by other groups within the DFG priority program.We will study the interaction of spin waves with chiral spin textures of skyrmion crystals, skyrmion patches, and individual skyrmions in nanostructures and thin films. Here, we will use time resolved magneto-optic Kerr microscopy, micro-focused Brillouin light scattering, and all-electrical detection to investigate spin wave propagation and the scattering of spin waves in skyrmion textures. We aim at the indirect detection of skyrmions and will investigate the associated magnon Hall effect. In parallel, we will perform local ferromagnetic resonance measurements on bilayers of ferromagnets and chiral magnets to determine phase diagrams of the samples.