The magnetocrystalline anisotropy of W- type hexagonal ferrites

Single ion anisotropy of Fe³⁺ions at each site of the 7 sublattices 2d, 4e, 4fIV, 4fVI, 6g, 12k, and 4f in the ferrite Zn2W has been calculated by crystal field theory using point charge approximation. As expected, the results show that the contributions of different sites are different which may be positive or negative. This model can explain the experimental results of substituted W-type ferrites.