Method for manufacturing a thin film magnetic recording medium
US4988578A · kind A · utility
19Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1990 |
| Grant date | Jan 29, 1991 |
| Priority date | — |
| Expiry date | Feb 22, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12951
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A film of magnetic recording media is formed by sputtering an alloy of cobalt and platinum onto a substrate. The sputtering takes place in a chamber containing argon and nitrogen. The magnetic coercivity of the resulting film is controlled by varying the concentration of nitrogen in the sputtering chamber. By using this technique, the film coercivity is controlled without varying other important parameters such as the saturation magnetization. The film coercivity can also be controlled by varying the concentration of oxygen in the sputtering chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.