Composite domain walls in flat nanomagnets: the magnetostatic limit

TL;DR

This paper analyzes the structure and energetics of vortex domain walls in soft magnetic nanoparticles, revealing their composition of topological defects and providing a qualitative model for their behavior.

Contribution

It introduces a detailed model of vortex domain walls as composite objects of topological defects and explains their energetics in soft magnetic nanostructures.

Findings

Vortex domain walls consist of two edge defects and a central vortex.

A qualitative energetics model explains the stability of these domain walls.

The structure is characterized by three elementary topological defects.

Abstract

We discuss the structure of the so-called "vortex" domain walls in soft magnetic nanoparticles. A wall of this kind is a composite object consisting of three elementary topological defects: two edge defects with winding numbers -1/2 and a vortex with a winding number +1 between them. We provide a qualitative model accounting for the energetics of such a domain wall.