Multi-phase carbon overcoats for magnetic discs

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

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Details

428408, 428694TC, 428900, G11B 572

Patent

active

059451912

ABSTRACT:
A magnetic disc for use in a magnetic disc drive is provided. The magnetic disc includes a recording surface wherein the recording surface includes a dual phase carbon overcoat. The dual phase carbon overcoat includes an amorphous carbon film sputtered on a magnetic layer. A doped amorphous carbon film is sputtered on the amorphous carbon film. The dual phase carbon overcoat has demonstrated improved hardness, reduced stiction and superior corrosion resistance over the prior art. A method of manufacturing the magnetic disc is also provided. The method includes providing a sputtering apparatus having a process chamber, providing a partially manufactured magnetic disc having a magnetic layer thereon, placing the partially manufactured magnetic disc within the process chamber, sputtering an amorphous carbon film on the magnetic layer, and sputtering a doped amorphous carbon film on the amorphous carbon film. The process reduces throughput inefficiencies due to down time cleaning and avoids carbon induced damage to the discs.

REFERENCES:
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patent: 4804590 (1989-02-01), Nakamura et al.
patent: 4877677 (1989-10-01), Hirochi et al.
patent: 5227211 (1993-07-01), Eltoukhy et al.
patent: 5679431 (1997-10-01), Chen et al.

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