Universal critical exponents of the magnetic domain wall depinning transition

ALBORNOZ, LUCAS J.; FERRERO, EZEQUIEL E.; KOLTON, ALEJANDRO B.; JEUDY, VINCENT; BUSTINGORRY, SEBASTIAN; CURIALE, JAVIER

PHYSICAL REVIEW B Letter

American Physical Society

Año: 2021 vol. 104

Magnetic-field-driven domain wall dynamics in a ferrimagnetic GdFeCo thin film with perpendicular magnetic anisotropy is studied using low-temperature magneto-optical Kerr microscopy. Measurements performedin a practically athermal condition allow for the direct experimental determination of the velocity (β =0.30 ± 0.03) and correlation length (ν = 1.3 ± 0.3) exponents of the depinning transition. The whole familyof exponents characterizing the transition is deduced, providing evidence that the depinning of magnetic domainwalls is better described by the quenched Edwards-Wilkinson universality class.