Tailoring the topological details of the magnetic skyrmion by the spin configuration at the edges

TL;DR

This paper demonstrates how external magnetic fields at the edges of chiral magnets can be used to tailor the detailed topological structure of magnetic skyrmions, ensuring their stability through numerical simulations.

Contribution

It introduces a method to control skyrmion topological details via boundary magnetic fields, enhancing stability and tunability in chiral magnets.

Findings

Skyrmion profiles can be tailored by boundary magnetic fields.

Stable skyrmion configurations are achievable with strong boundary ferromagnetism.

Numerical simulations confirm the stability of the tailored skyrmions.

Abstract

The magnetic skyrmion structure can be formed in the chiral magnets (CMs) with strong Dzyaloshinskii-Moriya interactions. In this work, we propose a way of artificially tailoring the topological details of the skyrmion such as its radial and whirling symmetric patterns by external magnetic fields besieging the CM slab. As long as the boundary magnetic fields are strong enough to fix the boundary ferromagnetism, the attained skyrmion profile is stable over time. The dynamics of spins is considered by numerically solving the non-equilibrium Landau-Lifshitz-Gilbert equation.