Magnetic and Recording Characteristics of Reactively Sputtered CoPtCr-(Si-O, Ti-O, and Cr-O) Perpendicular Media

A systematic investigation of the magnetic and recording characteristics of reactively sputtered CoPtCr-(Si-O, Ti-O, Cr-O) media has been performed. The optimum oxidation condition for media with well-isolated Co grains, high coercivity (H c ) and nucleation field (H n ), and superior media noise performance strongly depends on the oxide type. Despite differences in the optimum oxidation condition, the highest achievable H c and H n are similar. The transition jitter and magnetic write width are mainly determined by the magnetic exchange coupling depending on the oxidation condition but not by the oxide type