Sputtered carbon overcoat in a thin-film medium and sputtering method
US5679431A · kind A · utility
45Cited by
20References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1994 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Apr 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin-film magnetic recording medium having a carbon overcoat composed of an overcoat sublayer and an overcoat surface layer is described. The overcoat surface layer is a hydrogen- or nitrogen-containing sputtered carbon layer with high wear-resistance. The overcoat sublayer functions to reduce the diffusion of nitrogen or hydrogen from the surface layer to the magnetic recording layer. Also described is a method of sputtering the nitrogen-containing surface layer in which the graphite target is attached to the target electrode by thermally conducting, electrically conducting materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.