Journal Articles Physical Review B Year : 2017

Excess velocity of magnetic domain walls close to the depinning field

Abstract

Magnetic field driven domain wall velocities in [Co/Ni] based multilayers thin films have been measured using polar magneto-optic Kerr effect microscopy. The low field results are shown to be consistent with the universal creep regime of domain wall motion, characterized by a stretched exponential growth of the velocity with the inverse of the applied field. Approaching the depinning field from below results in an unexpected excess velocity with respect to the creep law. We analyze these results using scaling theory to show that this speeding up of domain wall motion can be interpreted as due to the increase of the size of the deterministic relaxation close to the depinning transition. We propose a phenomenological model to accurately fit the observed excess velocity and to obtain characteristic values for the depinning field H d , the depinning temperature T d , and the characteristic velocity scale v 0 for each sample.
Fichier principal
Vignette du fichier
Caballero 2017 PRB Excess velocity of magnetic domain walls close to the depinning field.pdf (1) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02999970 , version 1 (11-11-2020)

Licence

Identifiers

Cite

Nirvana Caballero, Iván Fernández Aguirre, Lucas J Albornoz, Alejandro Kolton, J.-C. Rojas-Sánchez, et al.. Excess velocity of magnetic domain walls close to the depinning field. Physical Review B, 2017, 96, ⟨10.1103/PHYSREVB.96.224422⟩. ⟨hal-02999970⟩
39 View
143 Download

Altmetric

Share

More