Poisson's process in the propagation of magnetic domain wall in perpendicularly magnetized film

TL;DR

This study analyzes the stochastic transit times of magnetic domain walls in thin films, revealing that their movement follows a Poisson process, which enhances understanding of the creep regime in magnetic materials.

Contribution

It demonstrates that domain wall transit times follow a Poisson process, providing a new statistical framework to analyze magnetic domain wall dynamics.

Findings

Transit time distribution fits a Poisson process model.

Number of jumps needed for magnetization reversal estimated.

Enhanced understanding of creep regime in magnetic films.

Abstract

We present here a statistical study of the transit time required for a magnetic domain wall to go through a small laser spot focused on 2D magnetic thin film. The domain wall velocity deduced this way is in good agreement with the other ways used to measure this parameter. But, the main fact is that the transit time is not a reproducible parameter, we have observed a quite large distribution of this parameter. This distribution can be explained assuming the movement to occur through jumps, whose probabilities are given by a Poisson's process. The fitting of this distribution has enabled us to get the required number of jumps to reverse the magnetization of the small area under the laser spot. This important parameter should lead to a better understanding of the creep regime.