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

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.