C Axis Orientation and Magnetic Properties of Barium Ferrite Films

Barium ferrite films with various crystal orientations were deposited by sputtering, and their magnetic properties were investigated. The film composition was changed with the position of the substrate. This composition change was partly caused by the changes in composition of the sputtered particles with changing emission angle during sputtering. Compared with particulate media with barium ferrite particles, which have a positive peak in the ΔM curve, the ΔM curve of these films has a negative peak, suggesting that a magnetostatic magnetic interaction is the main interaction between particles in the film. Film with random orientation had a larger negative peak than did film with a c-axis orientation.