Static and dynamic properties of vortices in anisotropic magnetic disks

TL;DR

This paper explores how magnetic anisotropy affects the static structure and dynamic behavior of vortices in small magnetic disks, revealing core enlargement and detailed vortex core reversal mechanisms.

Contribution

It provides new micromagnetic insights into how anisotropy influences vortex core size and the magnetization reversal process under pulsed magnetic fields.

Findings

Anisotropy enlarges the vortex core.

Anisotropy improves vortex structure resolution.

Detailed analysis of vortex-antivortex dynamics.

Abstract

We investigate the effect of the magnetic anisotropy ($K_z$) on the static and dynamic properties of magnetic vortices in small disks. Our micromagnetic calculations reveal that for a range of $K_z$ there is an enlargement of the vortex core. We analyze the influence of $K_z$ on the dynamics of the vortex core magnetization reversal under the excitation of a pulsed field. The presence of $K_z$, 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.