Flux Reversal in Soft Ferromagnetics

Abstract

To describe the flux reversal process in soft ferromagnetics, at least three mechanisms are required. A domain wall motion process is satisfactory only when the drive field is slightly larger than the coercive force. In the intermediate drive region, a nonuniform rotation model is necessary to be consistent with the experimental observations. In particular such a model predicts the observed linear relationship between drive and the inverse of the reversal time, the observed shape of the flux reversal transient and the observed value of the switching coefficient. In the high drive region with a transverse field applied, a coherent rotation model provides the best explanation of the experimental observations. The three regions can be demonstrated with a single sample in the case of the thin film.