Anisotropy and pinning field in nanocomposite magnetic materials

摘要

The pinning fields of domain wall at different grain boundary Ho have been calculated based on the given expression of anisotropy at grain boundary. The coercivity of nanocomposite magnetic materials is thought to be determined by H-0. Compared with the experiential formula of coercivity, the expression of exchange-coupling coefficient alpha(ex) corresponding to pinning fields on grain size D was given too. The results showed that Ho and alpha(ex) increase rapidly first, then increase slowly with increasing D. Our results are consistent with the relative theoretical and experimental results given by others. (C) 2007 Elsevier Ltd. All rights reserved.