Size-Dependence of Effective Anisotropy and Coercivity in Nanocomposite Permanent Magnetic Materials
Take into account different degree of exchange-coupling interaction between soft and hard grains, the effective anisotropy and coercivity in nanocomposite permanent magnetic materials has been investigated by adopting a statistical average physical model. The calculated results show a strong dependence of effective anisotropy and coercivity on the grain size in these materials. Using this model, the serious deterioration of coercivity in experiments especially when the grain size is less then 15nm could be explained in terms of the dramatic drop of the effective anisotropy in nanocomposites.
J. J. Guo et al., "Size-Dependence of Effective Anisotropy and Coercivity in Nanocomposite Permanent Magnetic Materials", Advanced Materials Research, Vols. 217-218, pp. 1689-1692, 2011