Digital recording method using a specified magnetic recording medium
US5453886A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1994 |
| Grant date | Sep 26, 1995 |
| Priority date | — |
| Expiry date | Jan 13, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24975
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium for digital recording has a magnetic layer on a non-magnetic substrate. The magnetic layer includes a lower layer of ferromagnetic metal thin film nearer to the substrate surface and an upper layer of ferromagnetic metal thin film, each ferromagnetic metal thin film being composed of columnar grains deposited by oblique evaporation process. The average growth directions of columnar grains in the lower and upper layers intersect each other from opposite sides of a normal to the substrate surface. Digital recording is carried out by means of a magnetic head in relative motion toward or opposite to the growth direction of columnar grains in the upper layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.