# Dynamical depinning of chiral domain walls

## TL;DR

This paper demonstrates through numerical analysis that the domain wall depinning field in magnetic systems depends on Gilbert damping, decreasing significantly at low damping values, contrary to traditional assumptions.

## Contribution

It reveals the damping dependence of the depinning field and explains it with a simple model considering internal domain wall dynamics and barrier size.

## Key findings

- Depinning field decreases with Gilbert damping, especially at low damping.
- The dependence is explained by internal domain wall dynamics and barrier size.
- The study challenges the conventional view of damping independence in depinning fields.

## Abstract

The domain wall depinning field represents the minimum magnetic field needed to move a domain wall, typically pinned by samples' disorder or patterned constrictions. Conventionally, such field is considered independent on the Gilbert damping since it is assumed to be the field at which the Zeeman energy equals the pinning energy barrier (both damping independent). Here, we analyse numerically the domain wall depinning field as function of the Gilbert damping in a system with perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction. Contrary to expectations, we find that the depinning field depends on the Gilbert damping and that it strongly decreases for small damping parameters. We explain this dependence with a simple one-dimensional model and we show that the reduction of the depinning field is related to the internal domain wall dynamics, proportional to the Dzyaloshinskii-Moriya interaction, and the finite size of the pinning barriers.