Creep and flow regimes of magnetic domain wall motion in ultrathin Pt/Co/Pt films with perpendicular anisotropy

TL;DR

This study investigates magnetic domain wall motion in ultrathin Pt/Co/Pt films, analyzing velocity behaviors across different regimes and providing insights into the underlying physics and damping parameters.

Contribution

It offers comprehensive velocity-field measurements and confirms theoretical predictions of creep and flow regimes in magnetic domain walls.

Findings

Identification of creep and flow regimes in domain wall motion

Quantitative analysis of damping parameter $\

Validation of precessional domain wall motion as the dissipation mechanism

Abstract

We report on magnetic domain wall velocity measurements in ultrathin Pt/Co(0.5-0.8 nm)/Pt films with perpendicular anisotropy over a large range of applied magnetic fields. The complete velocity-field characteristics are obtained, enabling an examination of the transition between thermally activated creep and viscous flow: motion regimes predicted from general theories for driven elastic interfaces in weakly disordered media. The dissipation limited flow regime is found to be consistent with precessional domain wall motion, analysis of which yields values for the damping parameter, $\alpha$.