Magnetic recording medium
US4636448A · kind A · utility
21Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1985 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Jan 16, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12986
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a magnetic recording medium particularly for perpendicular magnetization comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, a lower layer with low coercive force and high permeability, for example, of permalloy is sputtered on the substrate and an upper layer for perpendicular recording, for example, of cobalt-chromium alloy is sputtered on the lower layer, and the average grain diameter of the lower layer is less than one half of that of the upper layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.