Spin dynamics of hybrid skyrmion-magnon solitons

目前的自旋电子器件依赖于拓扑平凡铁磁体中磁矩的控制。手性磁体中的拓扑稳定的磁skyrmions提供了一种新的和有前途的平台，用于增强功能的信息传输和存储。为了实现这样的应用，需要详细了解潜在的磁化动力学。在这个项目中，我们研究了由铁磁体和手征磁体组成的混合系统中的磁化动力学。在这类混合系统中，skyrmions的磁化动力学可以耦合到拓扑上平凡的磁体中的激发，从而为结合两个系统的有利特性开辟了一条途径。在第二个资助期内，我们将研究这类动力学在两个相反区域中的混合。我们将探索长距离，光子介导的耦合均匀模式的激发，以及耦合的磁激发与大波矢在手征磁铁/铁磁体接口。我们将使用专门设计的微波谐振器的非本地耦合的手征磁铁和亚铁磁体的磁化动力学。因此，我们将依赖于众所周知的磁振子-光子耦合现象，以及在第一个资助期内发现的新颖的skyrmion-光子耦合。我们将进一步利用磁光技术，特别是布里渊光散射，以及微磁学模拟来研究自旋波与手征磁体和铁磁体界面处的磁skyrmion的相互作用。

Present spintronic devices rely on the control of magnetic moments in topologically trivial ferromagnets. Topologically stabilized magnetic skyrmions in chiral magnets provide a novel and promising platform for information transfer and storage with enhanced functionality. In order to realize such applications, a detailed understanding of the underlying magnetization dynamics is required. In this project, we study magnetization dynamics in hybrid systems consisting of ferromagnets and chiral magnets. The magnetization dynamics of skyrmions can couple to excitations in topologically trivial magnets in such hybrid systems, opening a pathway to unite advantageous properties of both systems.In the second funding period, we will study the hybridization of such dynamics in two opposite regimes. We will explore long distance, photon-mediated coupling of uniform-mode excitations as well as the coupling of magnetic excitations with large wave vectors at chiral magnet/ferromagnet interfaces.We will use specifically designed microwave resonators for a non-local coupling of the magnetization dynamics of chiral magnets and ferrimagnets. We will thereby rely on well-known magnon-photon coupling phenomena as well as on novel skyrmion-photon coupling revealed in the first funding period. Such non-local, cavity-mediated coupling phenomena with high cooperativity enable coherent transfer of excitations from topologically trivial to topologically stabilized magnetic texture.We will further employ magneto-optic techniques, in particular Brillouin Light Scattering, as well as micromagnetic simulations to study the interaction of spin waves with magnetic skyrmions at the interface of chiral magnets and ferromagnets.