Nitrogen -implanted, high carbon density overcoats for recording media
US6613422B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2001 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Jan 18, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of forming a layer of a novel hard, abrasion and corrosion resistant, nitrogen-doped, high carbon density, amorphous carbon or hydrogenated carbon (C:H) protective overcoat material on a surface of a recording medium comprises steps of:(a) providing a substrate including a stacked plurality of thin film layers thereon constituting the medium;(b) forming, by a process comprising generation and deposition of C ions having energies of at least about 90 eV, a layer of an amorphous carbon or hydrogenated carbon (C:H) material on the at least one surface of the substrate, the C:H layer having a high carbon density of at least about 2.0 gm/cm3; and(c) implanting nitrogen (N) ions in a surface portion of the high carbon density amorphous carbon or C:H layer to form an N-doped amorphous carbon or C:H surface layer having a carbon density substantially equal to said high C density of the C:H layer formed in step (b).Embodiments of the invention include thin-film magnetic and magneto-optical recording media including a layer of the novel material as a protective overcoat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.