Modeling the effect of grain size and dislocation density on hysteretic magnetic properties in steels

In this article, the Jiles-Atherton model is modified to elucidate the vari ation of magnetic properties with grain size and dislocation density. The m odified model predicts generally that coercive field increases with increas ing dislocation density and inverse grain size and that remanent flux densi ty and permeability at the coercive field decrease with increasing dislocat ion density and inverse grain size. Using the same model, it should be poss ible to model the effects of grain size and dislocation density on other ma gnetic measurements such as nonlinear harmonics of the flux density or Bark hausen noise. (C) 2001 American Institute of Physics.