1202.1885 (N. J. Zhou et al.)

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

N. J. Zhou, B. Zheng, Y. Y. He

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

View original: http://arxiv.org/abs/1202.1885