Magnetic recording medium having a cobalt-plantinum-chromium alloy magnetic layer and a chromium-tungsten underlayer a specified underlayer thickness range
US5298324A · kind A · utility
6Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Nov 10, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a rigid magnetic recording disk, the magnetic properties, such as the coercivity, of a cobalt based, hard, magnetic alloy, such as a cobalt-platinum-chromium (CoPtCr) thin film magnetic recording layer, are controlled by providing a thin, sputtered, underlayer of a nonmagnetic, binary, chromium-tungsten (CrW) alloy whose major constituent is chromium, and preferably of a composition Cr.sub.88 W.sub.12 upon which the thin film magnetic recording layer is subsequently sputter deposited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.