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Nonsteady dynamic properties of a domain wall for the creep state under an alternating driving field

N J Zhou¹, B Zheng²

¹Department of Physics, Hangzhou Normal University, Hangzhou 310036, People's Republic of China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 15, 2014

Abstract:

With Monte Carlo simulations, the nonsteady dynamic properties of a domain wall have been systematically investigated for the thermally activated creep state under an alternating driving field. Taking the driven random-field Ising model in two dimensions as an example, two distinct growth stages of the domain interface are identified with both the correlation length and roughness function. One stage belongs to the universality class of the random depositions, and the other to that of the quenched Edwards-Wilkinson equation. In the latter case, due to the dynamic effect of overhangs, the domain interface may exhibit an intrinsic anomalous scaling behavior, different from that of the quenched Edwards-Wilkinson equation.

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