Micromagnetic Simulation of Fast GHz Gyromotion of Magnetic Vortex Core in Permalloy Disk with Antidot

摘要

We report our micromagnetic simulation investigation of the magnetic vortex core motion in a disk with an antidot. With variation of antidot geometry, faster core gyration is expected, where gyrotropic motion near antidots becomes quite sensitively depending on the antidot geometry, with frequency up to several GHz. Our finding opens a possibility to boost up the core motion of a ferromagnetic nanostructure with introducing geometrical modulation.