Giant mode splitting of azimuthal spin waves in radial vortices

Abstract

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 $m=\pm 1$ 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.

10 pages, 9 figures

References in corpus (9)

• Direct observation of the Dzyaloshinskii-Moriya interaction in a Pt/Co/Ni film
• Magnetic Vortex Core Reversal by Excitation of Spin Waves
• Pattern recognition with a magnon-scattering reservoir
• Twisted Magnon Frequency Comb and Penrose Superradiance
• In-plane angular dependence of the spin-wave nonreciprocity of an ultrathin film with Dzyaloshinskii-Moriya interaction
• Direct Observation of Unusual Interfacial Dzyaloshinskii-Moriya Interaction in Graphene/NiFe/Ta Heterostructure
• Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves
• Stabilization and dynamics of magnetic antivortices in a nanodisk with anisotropic Dzyaloshinskii-Moriya interaction
• Nontrivial Aharonov-Bohm effect and alternating dispersion of magnons in cone-state ferromagnetic rings