# Topological domain walls in helimagnets

## TL;DR

This paper explores topological domain walls in helimagnets, revealing their structures, properties, and potential for innovative spintronic devices, drawing parallels with liquid crystal behavior and demonstrating their ability to carry skyrmion charge.

## Contribution

It introduces a new class of magnetic nano-objects with topologically non-trivial domain walls in helimagnets, supported by experimental and simulation evidence.

## Key findings

- Identified three fundamental types of domain walls in FeGe helimagnet.
- Demonstrated that domain walls can carry finite skyrmion charge.
- Showed potential for coupling to spin currents and topological Hall effects.

## Abstract

A magnetic helix arises in chiral magnets with a wavelength set by the spin-orbit coupling. We show that the helimagnetic order is a nanoscale analog to liquid crystals, exhibiting topological structures and domain walls that are distinctly different from classical magnets. Using magnetic force microscopy and micromagnetic simulations, we demonstrate that - similar to cholesteric liquid crystals - three fundamental types of domain walls are realized in the helimagnet FeGe. We reveal the micromagnetic wall structure and show that they can carry a finite skyrmion charge, permitting coupling to spin currents and contributions to a topological Hall effect. Our study establishes a new class of magnetic nano-objects with non-trivial topology, opening the door to innovative device concepts based on helimagnetic domain walls.