Dynamics of a ferromagnetic domain wall and the Barkhausen effect
Materials Science
2009-10-30 v1 Statistical Mechanics
Abstract
We derive an equation of motion for the the dynamics of a ferromagnetic domain wall driven by an external magnetic field through a disordered medium and we study the associated depinning transition. The long-range dipolar interactions set the upper critical dimension to be , so we suggest that mean-field exponents describe the Barkhausen effect for three-dimensional soft ferromagnetic materials. We analyze the scaling of the Barkhausen jumps as a function of the field driving rate and the intensity of the demagnetizing field, and find results in quantitative agreement with experiments on crystalline and amorphous soft ferromagnetic alloys.
Keywords
Cite
@article{arxiv.cond-mat/9709300,
title = {Dynamics of a ferromagnetic domain wall and the Barkhausen effect},
author = {Pierre Cizeau and Stefano Zapperi and Gianfranco Durin and H. Eugene Stanley},
journal= {arXiv preprint arXiv:cond-mat/9709300},
year = {2009}
}
Comments
4 RevTex pages, 3 ps figures embedded