Magnetic recording medium comprising a glass substrate and a gamma Fe.sub.2 .sub.3 magnetic thin film with specified X-ray diffraction and surface roughness
US5094897A · kind A · utility
11Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1990 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Apr 26, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type is durable and exhibits good electromagnetic properties when the magnetic layer predominantly composed of .gamma.-Fe.sub.2 O.sub.3 has specific peak area ratios in an X-ray diffraction chart thereof. Inclusion of .alpha.-Fe.sub.2 O.sub.3 in the magnetic layer is also effective. Reliable recording/reproduction can be conducted on the magnetic recording disk using a flying magnetic head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.