径向涡旋中方位角自旋波的巨模式分裂
Giant mode splitting of azimuthal spin waves in radial vortices
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中文总结 AI 辅助
该研究发现径向涡旋中无涡核时也存在源于DMI的巨方位角自旋波模式分裂，其幅度远大于涡核诱导的分裂，为手性磁结构模式分裂提供了新机制。
中文摘要 AI 辅助
径向涡旋是铁磁圆盘内由界面Dzyaloshinskii-Moriya相互作用（DMI）稳定的拓扑自旋结构。此前研究表明，传统圆形涡旋中方位角模式的双重分裂源于方位角自旋波与涡核（VC）的耦合，该效应仅在方位角指数m=±1时出现，高阶模式中不存在。本文提出，径向涡旋中即使无VC也存在方位角自旋波的巨模式分裂，该分裂源于DMI，其幅度可比VC诱导的分裂大一个数量级；且DMI诱导的频率分裂随DMI常数和模式指数增大，高阶方位角模式中可达数十GHz。研究揭示了手性磁结构中模式分裂的可靠机制，深化了对受限磁体中DMI效应与自旋波动力学的基础理解。
英文摘要
Radial vortex is a topological spin texture stabilized by the interfacial Dzyaloshinskii-Moriya interaction (DMI) in ferromagnetic disks. Previous investigations have shown that the doublet splitting of azimuthal modes in traditional circular vortices arises from the coupling between azimuthal spin waves and vortex core (VC), an effect occurs only for azimuthal indices $m=\pm1$ and is absent for higher-order modes. Here, we present a giant mode splitting of azimuthal spin waves in radial vortices, even in the absence of the VC. This mode splitting arises from the DMI, which can be an order of magnitude larger than that induced by the VC. Moreover, the DMI-induced frequency splitting increases with both the DMI constant and mode index, reaching tens of GHz for higher-order azimuthal modes. Our results reveal a robust mechanism for mode splitting in chiral magnetic textures and deepen the fundamental understanding of the DMI effect on the spin-wave dynamics in confined magnets.
