Method for manufacturing thin-film medium with chromium underlayer gradient
US5356522A · kind A · utility
29Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1992 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Dec 23, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J37/3452
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic thin-film medium is disclosed. The medium includes a disc-like non-metallic substrate, and a sputtered underlayer having an axial composition gradient in which a lowermost stratum of the layer is a coating metal, such as Ti, V, or W, and an uppermost stratum of the underlayer is Cr. A magnetic thin-film layer is formed on the substrate, and a overcoat is formed on the magnetic layer. Also disclosed is a method of forming the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.