Thermal generation of droplet soliton in chiral magnet

TL;DR

This paper demonstrates a method to thermally generate chiral magnetic droplets, zero topological charge solitons, using simulations and transition state theory, enabling controlled creation of complex magnetic textures.

Contribution

It introduces a novel protocol for creating chiral droplets via thermal fluctuations and magnetic field tilt, expanding the control over magnetic soliton states.

Findings

Chiral droplets can be reliably created thermally in simulations.

The protocol allows selective generation of droplets or skyrmions.

Coexistence of different solitons enables complex magnetization dynamics.

Abstract

Controlled creation of localized magnetic textures beyond conventional $\pi$-skyrmions is an important problem in the field of magnetism. Here by means of spin dynamics simulations, Monte Carlo simulations and harmonic transition state theory we demonstrate that an elementary chiral magnetic soliton with zero topological charge -- the chiral droplet -- can be reliably created by thermal fluctuations in the presence of the tilted magnetic field. The proposed protocol relies on an unusual kinetics combining the effects of the entropic stabilization and low energy barrier for the nucleation of a topologically-trivial state. Following this protocol by varying temperature and the tilt of the external magnetic field one can selectively generate chiral droplets or $\pi$-skyrmions in a single system. The coexistence of two distinct magnetic solitons establishes a basis for a rich magnetization dynamics and opens up the possibility for the construction of more complex magnetic textures such as skyrmion bags and skyrmions with chiral kinks.