Abstract
The preparation and magnetic properties of cobalt-ferrite epitaxial iron oxides were investigated. The lattice images of the oxides showed that the cobalt-ferrite was epitaxially crystallized on the surface of γ-Fe2O3 particles. The oxides had uniaxial magnetic anisotropy, and the increase of coercivity of the oxides was attributed to the magnetic anisotropy of the coblat-ferrite. The magnetic properties, such as a variation of coercivity in annealing or a printing effect were stable compared with those of cobalt-doped iron oxides. Such stable properties were explained by considering that cobalt ions existed in highly concentrated State on the surface of y-Fe2O3, and the migration of cobalt ions was difficult.
