Perpendicular magnetic recording medium and manufacturing method thereof
US4731300A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1986 |
| Grant date | Mar 15, 1988 |
| Priority date | — |
| Expiry date | Feb 26, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12931
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording medium comprises a recording medium base, a low coercivity layer formed on the recording medium base and having a low coercivity in an in-plane direction thereof, and a high coercivity layer formed on the low coercivity layer and having a high coercivity in a direction perpendicular to a surface of the low coercivity layer. The low coercivity layer and the high coercivity layer are formed from the same magnetic material and constitute a magnetic layer. A method of manufacturing this perpendicular magnetic recording medium comprises a single magnetic layer forming process of successively and continuously forming the low coercivity layer and the high coercivity layer on the recording medium base by using the same magnetic material as a depositing material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.