Magnetic plated media
US4619872A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1985 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Dec 26, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1275
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for producing magnetic plated media suitable for use in high-performance disk drives is disclosed. A layer of nickel is first provided on a standard aluminum alloy substrate, by electroless deposition, to improve adhesion of subsequent layers. A layer of nickel phosphorous and a magnetic layer of nickel cobalt are then, in turn, electroplated. The plated media disk is then oxidized below a nickel-magnetizing temperature to provide a protective outer surface. A variation of this process is also disclosed. This time a magnetically-shielding copper layer is electroplated over the first nickel layer. The nickel phosphorous and nickel cobalt layers are then electroplated on as before. The plated media can now be oxidized at a temperature higher than the nickel-magnetizing temperature to speed up the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.