Thermal rounding of the depinning transition in ultrathin Pt/Co/Pt films

BUSTINGORRY SEBASTIAN; KOLTON ALEJANDRO B.; GIAMARCHI THIERRY

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2012 vol. 85 p. 214416 - 214423

1098-0121

We perform a scaling analysis of the mean velocity of extended magnetic domain walls driven in ultrathin Pt/Co/Pt ferromagnetic films with perpendicular anisotropy, as a function of the applied external field for different film thicknesses. We find that the scaling of the experimental data around the thermally rounded depinning transition is consistent with the universal depinning exponents theoretically expected for elastic interfaces described by the one-dimensional quenched Edwards-Wilkinson equation. In particular, values for the depinning exponent beta and thermal rounding exponent psi are tested, and the present analysis of the experimental data is compatible with beta=0.33 and psi=0.2, in agreement with numerical simulations.