Universal Depinning Transition of Domain Walls in Ultrathin Ferromagnets

TL;DR

This paper uncovers a universal scaling law for the depinning transition of magnetic domain walls in ultrathin ferromagnets, integrating thermal and drive effects, and advancing understanding of glassy dynamics in disordered systems.

Contribution

It introduces a universal scaling function for domain wall depinning that accounts for thermal and drive influences, unifying different ferromagnetic systems.

Findings

Universal scaling function for depinning transition

Consistent description of depinning and creep motion

Insights into glassy dynamics of elastic objects

Abstract

We present a quantitative and comparative study of magnetic field driven domain wall depinning transition in different ferromagnetic ultrathin films over a wide range of temperature. We reveal a universal scaling function accounting for both drive and thermal effects on the depinning transition, including critical exponents. The consistent description we obtain for both the depinning and subthreshold thermally activated creep motion should shed light on the universal glassy dynamics of thermally fluctuating elastic objects pinned by disordered energy landscapes.