Thin carbon overcoat and method of its making
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United States of America Patent
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Oct 22, 1996
Grant Date -
N/A
app pub date -
Oct 8, 1993
filing date -
Oct 8, 1993
priority date (Note) -
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Abstract
A thin film magnetic disc having a carbon overcoat which is characterized by (i) a surface density of nitrogen atoms between 3-8.times.10.sup.16 atoms/cm.sup.2, as determined by Rutherford backscatter spectroscopy, and (ii) an erosion rate, as measured by rate of erosion of the overcoat by an Al.sub.2 O.sub.3 particle tape placed in contact with the medium, that is several times less than that of a carbon overcoat having the same thickness, but formed by sputtering under a pure argon atmosphere. The overcoat has a preferred thickness between 80-150 .ANG.. Also disclosed is a method of producing a thin, wear-resistant carbon overcoat.
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