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A new type of oxide composite film was proposed as perpendicular magnetic recording medium. The storage layer is composed of Co-Pt and Ti-oxide. By transmission electron microscopy (TEM) observation, the film exhibited a well isolated fine granular structure with small and uniform Co-Pt grains surrounded by TiO2. More sufficient segregation by TiO2 was realized from the beginning of the layer growth compared with other oxide addition film, resulting in a magnetically weak coupled structure. This film has a relatively large magnetic anisotropy constant (Ku) and saturation magnetization (Ms) of more than 5×106 erg/cm3 and about 800 emu/cm3, respectively. The structure was brought about by a high sputtering gas pressure of Co-Pt-TiO2 film deposition.
Date of Publication: Oct. 2005