A Thin Film Disk With an Oxide Layer Between the Magnetic Layer And the Carbon Overcoat for Improved Corrosion Resistance
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-16
The corrosion resistance of conventional thin film disks with protective amorphous carbon overcoats can be improved by forming an oxide layer between the magnetic layer and the overcoat. In one example, an oxide film is formed on a cobalt-chromium alloy magnetic layer by sputtering in an argon-oxygen environment. Thereafter, an amorphous carbon film is formed by sputtering a graphite target in the presence of pure argon. The oxide film, which is predominantly chromium oxide, also contains cobalt oxide and hydroxides of cobalt and chromium. The oxide layer may also be formed by mere exposure of the magnetic layer to the atmosphere.