Short-time domain-wall dynamics in the random-field Ising model with a driving field

Abstract

With Monte Carlo methods, we investigate the relaxation dynamics of a domain wall in the two-dimensional random-field Ising model with a driving field. The short-time dynamic behavior at the depinning transition is carefully examined, and the roughening process of the domain wall is observed. Based on the short-time dynamic scaling form, we accurately determine the transition field, static and dynamic exponents, and local and global roughness exponents. In contrast to the usual assumption, the results indicate that the domain interface does not belong to the universality class of the Edwards-Wilkinson equation. In particular, due to the dynamic effect of overhangs, the domain interface exhibits intrinsic anomalous scaling and spatial multiscaling behaviors, compatible with the experiments

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Cited by in corpus (6)

• Dynamic effect of overhangs and islands at the depinning transition in two-dimensional magnets
• Dynamical Properties of Random Field Ising Model
• Universality class of the depinning transition in the two-dimensional Ising model with quenched disorder
• Relaxation-to-creep transition of domain-wall motion in two- dimensional random-field Ising model with ac driving field
• Depinning phase transition in two-dimensional clock model with quenched randomness
• Intrinsic anomalous scaling in a ferromagnetic thin film model