Magnetic recording medium and its manufacturing method
US5637393A · kind A · utility
43Cited by
1References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1993 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Jul 23, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a non-magnetic substrate, a ferromagnetic thin film on the non-magnetic substrate, a hard carbon film on the ferromagnetic thin film, a modified layer of which atomic ratio of nitrogen/carbon is 0.8% or more, and of which thickness is less than 3 nm on the hard carbon film, and a lubricant layer on the modified layer, has excellent electromagnetic conversion characteristic, running stability, durability, and weatherability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.