Hexagonal ferrite particles for perpendicular recording prepared by the precursor method

Single domain MFe
12
O
19
(M=Ba Sr) hexagonal ferrite particles have been prepared by the precursor or liquid mix technique. It is shown that single phase samples with different mean diameter and diameter to thickness ratio may be prepared by modifications of thermal treatments. It is shown as well that surface spin canting has been formed and that the magnetocrystalline anisotropy is reduced by the platelet-like shape anisotropy.