Effects of microstructure on effective anisotropy and coercivity in nanometer hard magnetic materials

The effects of grain size distribution and intergranular phase on effective anisotropy K_eff and coercivity H_c have been investigated in nanometer hard magnetic materials. In order to obtain higher K_eff and H_c grain size should be larger than 15 nm, and the grain size distribution should be as central as possible. The existence of intergranular phase may result in the enhancement of coercivity. The variation of coercivity with grain size is very similar to that of given by Manaf et al.