Interparticle interactions in perpendicularly and longitudinally oriented Ba-ferrite particulate media are studied experimentally. In order to make clear the effect of the orientation on the interparticle interactions in the media, the angular dependence of the interaction fields is measured by compensating for the demagnetizing fields at each measurement direction. It is found that perpendicularly and longitudinally oriented Ba-ferrite particulate media exhibit quite different angular dependence of the interaction fields, even though both of the media were prepared using the same dispersion. The study of the magnetic anisotropy derived from the interparticle interactions, which is significantly sensitive to the arrangement of the particles in the media, is considered to be useful for estimating the morphology of the magnetic layer of the media.
A study o~ the microstructure of and the origin of magnetic anisotropy in evaporated Co-O thin film has been carried out. It was found that the strong perpendicular magnetic anisotropy of Co-O thin film can be attributed to the magnetocrystalline anisotropy along the c-axis preferred orienta tion of Co and the shape anisotropy of each Co particle.
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