Domain Wall Depinning in Random Media by AC Fields

Details Domain Wall Depinning in Random Media by AC Fields Domain Wall Depinning in Random Media by AC Fields

2002-05-24

arxiv.org/abs/cond-mat/0205515v2

Phys. Rev. Lett. 90, 047201 (2003)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.047201

The viscous motion of an interface driven by an ac external field of frequency omega_0 in a random medium is considered here for the first time. The velocity exhibits a smeared depinning transition showing a double hysteresis which is absent in the adiabatic case omega_0 --> 0. Using scaling arguments and an approximate renormalization group calculation we explain the main characteristics of the hysteresis loop. In the low frequency limit these can be expressed in terms of the depinning threshold and the critical exponents of the adiabatic case.

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