Universal dimensional crossover of domain wall dynamics in ferromagnetic films

TORRES, W. SAVERO; PARDO, R. DÍAZ; BUSTINGORRY, S.; KOLTON, A.B.; LEMAÎTRE, A.; JEUDY, V.

Physical Review B

American Physical Society

Año: 2019 vol. 99

2469-9950

The magnetic domain wall motion driven by a magnetic field is studied in (Ga,Mn)As and (Ga,Mn)(As,P) films of different thicknesses. In the thermally activated creep regime, a kink in the velocity curves and a jump of the roughness exponent evidence a dimensional crossover in the domain wall dynamics. The measured values of the roughness exponent ζ1d=0.62±0.02 and ζ2d=0.45±0.04 are compatible with theoretical predictions for the motion of elastic line (d=1) and surface (d=2) in two- and three-dimensional media, respectively.