Effect of dipolar interactions for domain wall dynamics in magnetic thin films

TL;DR

This paper investigates how long-range dipolar interactions influence the behavior and structure of domain walls in magnetic thin films, revealing a transition in universality class and morphology through numerical simulations.

Contribution

It introduces a detailed numerical study of the impact of dipolar forces on domain wall dynamics and morphology, highlighting a crossover in universality class.

Findings

Identification of a crossover from short-range to long-range dominated behavior

Change in domain wall morphology from rough to zigzag structures

Demonstration of universality class transition in avalanche size distribution

Abstract

We study the effect of long range dipolar forces on the dynamics and morphology of domain walls in magnetic thin films by numerical simulations of the spin-1 random field Ising model. By studying the size distribution of avalanches of domain wall motion arising as a response to quasistatic external driving, we observe a cross-over from the case dominated by short range interactions to another universality class where the long range dipolar forces become important. This crossover is accompanied with a change of the domain wall morphology from a rough wall to walls with zigzag structure.