Magnetic Vortex with Skyrmionic Core in Thin Nanodisk of the Chiral Magnets

TL;DR

This paper reports the discovery of a vortex spin texture with a skyrmionic core in thin chiral magnetic nanodisks, which can be stabilized and modulated by disk size and anisotropy, potentially serving as a basis for future experimental research.

Contribution

It introduces a new vortex spin texture with a skyrmionic core in chiral magnetic nanodisks, stabilized by size and anisotropy, and demonstrates its spontaneous ground state formation.

Findings

Skyrmionic core size can be continuously modulated by disk size.

Vortex state can be a spontaneous ground state without external fields.

Uniaxial anisotropy stabilizes the vortex spin texture.

Abstract

A type of vortex spin texture with skyrmionic core and a series of circle spin stripes was obtained in thin nanodisk of the chiral magnets with Dzyaloshinskii-Moriya interaction and uniaxial anisotropy by means of micromagnetic approach and Monte Carlo simulation. The size of skyrmionic core can be modulated continuously by controlling the disk size. Moreover, in some certain values of the disk size, this vortex state may be spontaneous ground state even without the help of the external magnetic field and thermal fluctuation. In addition, the uniaxial anisotropy is able to stabilize this vortex spin texture. We anticipate that the present work will inspire further experimental studies for exploring the spin structure.