Micromagnetic simulations of magnetic normal modes in elliptical nanomagnets with a vortex state.

Combined methods of micromagnetic simulation and Fourier analysis are employed to study the gyrotropic magnetic excitations triggered by a short in-plane Gaussian field pulse in ellipse-shaped Permalloy elements with a vortex state. We observed a series of vortex-core azimuthal magnetic normal modes. The frequency of gyrotropic mode increases with the element thickness up to 40 nm, and then a dip appears in the frequency for thickness varying from 40 to 60 nm. [ABSTRACT FROM AUTHOR]