Method and apparatus for producing a magnetic recording medium
US4997539A · kind A · utility
20Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1989 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Jul 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for producing a magnetic recording medium, which comprises forming, by sputtering, a thin undercoating layer and a thin cobalt alloy magnetic layer sequentially on a substrate, wherein an intermediate electrode is provided in the vicinity of the target to enclose at least 1/2 of the circumference of the sputter erosion end of the target, and at least one of the undercoating layer and the cobalt alloy magnetic layer is formed under such condition that a positive potential relative to the substrate and the grounded portion of the main body of the layer-forming apparatus, is applied to the intermediate electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.