Vortex gyration mediated by spin waves driven by an out-of-plane oscillating magnetic field

TL;DR

This paper investigates how out-of-plane oscillating magnetic fields excite spin waves that induce vortex core gyration and alter damping, providing insights into vortex dynamics driven by magnetic fields.

Contribution

It demonstrates the role of spin waves excited by perpendicular magnetic fields in mediating vortex gyration and damping changes, a novel insight into vortex core dynamics.

Findings

Spin waves can induce vortex gyration under out-of-plane magnetic fields.

Gyration damping is affected when spin waves and vortex motion are simultaneously excited.

Energy analysis explains the origin of spin-wave-mediated vortex gyration.

Abstract

In this letter we address the vortex core dynamics involved in gyration excitation and damping change by out-of-plane oscillating magnetic fields. When the vortex core is at rest under the effect of in-plane bias magnetic fields, the spin waves excited by the perpendicular magnetic field can induce obvious vortex gyration. When simultaneously excite spin waves and vortex gyrotropic motion, the gyration damping changes. Analysis of the system energy allows us to explain the origin of the spin-wave-mediated vortex gyration.