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Anisotropic Skyrmion Diffusion Controlled by Magnetic-Field-Induced Symmetry Breaking
Physical Review Applied ( IF 4.6 ) Pub Date : 2021-04-20 , DOI: 10.1103/physrevapplied.15.044029
Nico Kerber , Markus Weißenhofer , Klaus Raab , Kai Litzius , Jakub Zázvorka , Ulrich Nowak , Mathias Kläui

The diffusion of particles has wide repercussions, ranging from particle-based soft-matter systems to solid-state systems with particular electronic properties. Recently, in the field of magnetism, the diffusion of magnetic skyrmions, topologically stabilized quasiparticles, has been demonstrated. Here, we show that, by applying a magnetic in-plane field, and therefore, breaking the symmetry of the system, skyrmion diffusion becomes anisotropic, with faster diffusion parallel to the field axis and slower diffusion perpendicular to it. We furthermore show that the absolute value of the applied magnetic in-plane field controls the absolute values of the diffusion coefficients, so that one can thereby tune both the orientation of the diffusion and its strength. Based on the stochastic Thiele equation, we can explain the observed anisotropic diffusion as a result of the elliptical deformation of the skyrmions by the application of the in-plane field.

中文翻译:

磁场诱导对称性断裂控制的各向异性Skyrmion扩散

粒子的扩散具有广泛的影响,范围从基于粒子的软物质系统到具有特定电子特性的固态系统。近来,在磁性领域中,已经证明了磁性天体离子,拓扑稳定的准粒子的扩散。在这里,我们表明,通过施加面内磁场,从而破坏系统的对称性,天sky子的扩散变得各向异性,平行于场轴的扩散更快,垂直于场轴的扩散更慢。我们进一步表明,所施加的平面内磁场的绝对值控制扩散系数的绝对值,因此人们可以同时调整扩散的方向及其强度。根据随机的Thiele方程,
更新日期:2021-04-20
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