Creep motion of a domain wall in the two-dimensional random-field Ising model with a driving field
Department of Physics, Zhejiang University - Hangzhou 310027, PRC
2 Department of Physics, Hangzhou Normal University - Hangzhou 310036, PRC
Accepted: 3 April 2012
With Monte Carlo simulations, we study the creep motion of a domain wall in the two-dimensional random-field Ising model with a driving field. We observe the nonlinear field-velocity relation, and determine the creep exponent μ. To further investigate the universality class of the creep motion, we also measure the roughness exponent ζ and energy barrier exponent ψ from the zero-field relaxation process. We find that all the exponents depend on the strength of disorder.
PACS: 64.60.Ht – Dynamic critical phenomena / 05.10.Ln – Monte Carlo methods / 75.60.Ch – Domain walls and domain structure
© EPLA, 2012