We investigate the effect of the magnetic anisotropy (Kz) on the static and dynamic properties of magnetic vortices in small disks. Our micromagnetic calculations reveal that for a range of Kz there is an enlargement of the vortex core. We analyze the influence of Kz on the dynamics of the vortex core magnetization reversal under the excitation of a pulsed field. The presence of Kz, which leads to better resolved vortex structures, allows us to discuss in more details the role played by the in-plane and perpendicular components of the gyrotropic field during the vortex-antivortex nucleation and annihilation.
@article{arxiv.0807.4546,
title = {Static and dynamic properties of vortices in anisotropic magnetic disks},
author = {Tiago S. Machado and Tatiana G. Rappoport and Luiz C. Sampaio},
journal= {arXiv preprint arXiv:0807.4546},
year = {2009}
}