Domain wall dynamics in soft magnetic materials

Abstract

The dynamics of a domain wall in magnetostrictive materials is investigated. The domain wall is modeled by a d-dimensional interface moving in a d+1-dimensional environment. Long-range demagnetization effects and quenched disorder are considered, while the external magnetic field is increased at constant rate. Exact expressions for the average interface velocity and susceptibility are obtained, resulting that the system is critical when the demagnetization constant and the average interface velocity vanishes. The critical exponents are computed to O(4-d). Our predictions are compared with numerical simulations and Barkhausen noise measurements reported in the literature.

4 pages, RevTex. Substantial changes have been made. In the previous version we conclude that long-range and local demagnetization effects lead to different universality classes. However, after a detailed analysis of our calculations we found out that this conclusion is wrong, they actually belong to the same universality class