Perpendicular magnetic recording medium
US4544591A · kind A · utility
6Cited by
9References
25Claims
0Family size
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Inventors
Key dates
| Filing date | Sep 30, 1983 |
| Grant date | Oct 1, 1985 |
| Priority date | — |
| Expiry date | Sep 30, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24975
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a perpendicular magnetic recording medium comprising a high permeability film and a perpendicular magnetization film which are laminated on a non-magnetic substrate, a perpendicular magnetic recording medium is provided wherein a permanent magnet film is further sandwiched between the non-magnetic substrate and the high permeability film, thereby eliminating a spike noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.