Method and coating transition metal oxide on thin film magnetic disks
US4876117A · kind A · utility
23Cited by
6References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1988 |
| Grant date | Oct 24, 1989 |
| Priority date | — |
| Expiry date | Feb 4, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Hard magnetic recording disks include a rigid substrate, typically aluminum, ceramic, or glass, having an underlayer thereover, typically being nickel-phosphorus. A ferromagnetic film is formed over the underlayer, and a protective coating layer formed over the ferromagnetic layer. The protective coating layer is a metal oxide formed by applying a liquid metal oxide precursor material over the ferromagnetic layer, and curing the liquid precursor material to leave a metal oxide layer in place. Optionally, a lubricating or carbon layer may be formed over the protective layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.