Dynamic effect of overhangs and islands at the depinning transition in two-dimensional magnets

Details Dynamic effect of overhangs and islands at the depinning transition in two-dimensional magnets Dynamic effect of overhangs and islands at the depinning transition in two-dimensional magnets

2012-02-07

arxiv.org/abs/1202.1349v1

Physical Review E 82, 031139 (2010)

Physics

Condensed Matter

Statistical Mechanics

9 pages, 6 figures

Scientific paper

10.1103/PhysRevE.82.031139

With the Monte Carlo methods, we systematically investigate the short-time dynamics of domain-wall motion in the two-dimensional random-field Ising model with a driving field ?DRFIM?. We accurately determine the depinning transition field and critical exponents. Through two different definitions of the domain interface, we examine the dynamics of overhangs and islands. At the depinning transition, the dynamic effect of overhangs and islands reaches maximum. We argue that this should be an important mechanism leading the DRFIM model to a different universality class from the Edwards-Wilkinson equation with quenched disorder

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