A study on the efficient deperm protocol in hard magnetic material using Preisach model

Recently developed magnetic materials have large coercivity force and squareness ratio for the industrial demand. In the area of electric and electronic industry and defense development, deperm protocol is needed to reduce residual magnetization to zero. But conventional deperm protocol has limitation that isn't considered hysteresis property of ferromagnetic material. For efficient and reliable deperm result, this paper proposed a deperm analysis process using combined 2-D Preisach modeling and FEM. And we conducted analysis to figure out the relation of deperm current and ferromagnetic material property in hard magnetic material. Through the research of trace on the Preisach plane, the case, which is remained many number of trace on the high density of coercivity force according to the deperm current, is effective.