Field-Driven Evolution of Chiral Spin Textures in Thin Nanodisk of the Helimagnets

TL;DR

This study uses Monte Carlo simulations to explore how magnetic fields influence chiral spin textures in thin helimagnet nanodisks, revealing size-dependent behaviors and stabilization mechanisms for skyrmions and vortices.

Contribution

It provides new insights into the field-driven evolution of spin textures in nanodisks, highlighting the roles of size, anisotropy, and dipolar interactions.

Findings

Spin textures evolve from complex states to magnetic vortices with increasing field.

Skyrmion arrangements depend strongly on disk size.

Uniaxial anisotropy and dipolar coupling can stabilize skyrmionic vortices.

Abstract

The magnetic field-driven evolution of chiral spin textures in thin helimagnet nanodisk with varied size are investigated by means of Monte Carlo simulation. It is demonstrated that the complex spin texture may simply be regarded as the superposition of the edged state with in plane spin orientation perpendicular or parallel to the edge and the bulk state with the features similar to two-dimensional chiral magnetic films. With the increase of the external field, the proportion of the parallel spins of the edge state increases, and the spin textures finally transfers into edged magnetic vortex. The arrangement of skyrmions strongly depends on the disk size. In addition, the uniaxial anisotropy and dipolar coupling in certain ranges are able to stabilize a special magnetic vortex with Skyrmionic core while the disk size is comparable with the wavelength of helix state.