Thin film magnetic recording film
US4631202A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73919
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin film magnetic recording disc is provided wherein the magnetic layer is an alloy of cobalt and platinum disposed on a chromium layer. A barrier layer of chromium is formed on the cobalt-platinum film and a wear layer of an oxide of cobalt is provided on the barrier layer. The platinum content in the magnetic film is varied so as to provide a magnetic film with a desired coercivity which is significantly less dependent upon film thickness. This permits the cobalt-platinum film thickness to be adjusted to meet a wide range of recording system design parameters. The coercivity of the magnetic film may be determined primarily by the amount of platinum in the alloy and the saturation magnetization-thickness product of the film is determined primarily by the film thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.