Spin Dynamics of a Magnetic Antivortex

Details Spin Dynamics of a Magnetic Antivortex Spin Dynamics of a Magnetic Antivortex

2006-08-10

arxiv.org/abs/cond-mat/0608245v1

Physics

Condensed Matter

Materials Science

Scientific paper

We report on a study of the dynamics of a magnetic antivortex in a submicron, asteroid shaped, permalloy ferromagnet using micromagnetic simulations. As with vortex states in disk and square geometries, a gyrotropic mode was found in which a shifted antivortex core orbits about the center of the asteroid. Pulsed magnetic fields were used to generate azimuthal or radial spin wave modes, depending on the field orientation. The degeneracy of low frequency azimuthal mode frequencies is lifted by gyrotropic motion of the antivortex core, and restored by inserting a hole in the center of the particle to suppress this motion. We briefly compare the dynamics of the vortex state of the asteroid to the antivortex. The size dependence of the antivortex modes is reported.

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