Preparation and Evaluation of Ferrite Thin Film Flexible Media

Ferrite thin films have been prepared for use as high density magnetic recording tapes. Their recording characteristics as well as mechanical properties were evaluated. Ferrite thin film tapes were prepared by direct Fe3O4 sputter deposition on heat-resistant flexible base films, followed by heat-treatment. Internal stress in the ferrite thin film depends upon sputtering pressure and power. Excellent magnetic properties applicable to high density recording media, were obtained. After the oxidation, Rmax≤0.03μm film surface roughness was attained.Lubricated ferrite thin film tapes have excellent corrosion resistivity and sufficient low friction coefficient. High recording dencity, D6dB of 50 K-FRPI, was obtained. The ferrite thin film tapes feature low noise and high C/N(≥41 dB). Experiments on color picture recordings were performed using a home VTR.