Thin carbon overcoat and method of its making
US5567512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1993 |
| Grant date | Oct 22, 1996 |
| Priority date | — |
| Expiry date | Oct 8, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.