We studied the magnetic properties of epitaxial CoFe2O4 films as a function of oxygen post-annealing and film thickness. All as-deposited films exhibited similar magnetic properties with Ms of approximately 50% of the bulk saturated magnetization (Ms). After the post-annealing the Ms changed as a consequence of crystallographic restructuring of the film. Cation ordering in 100nm thick films reduced Ms, whereas re-oxidation increased Ms for thinner films. 13nm films, annealed for 1h, reached the bulk Ms. For even thinner films the quantum-size effect reduced Ms.
COBISS.SI-ID: 1101307