Magnetic recording medium, magnetic recording medium manufacture method, and information regeneration apparatus
US6620481B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 2001 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7266
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed a magnetic recording medium in which reduced magnetic spacing and secured contact sliding durability are compatible with each other, and the magnetic recording medium includes: a disk-like substrate 1; an underlayer 2 formed on the substrate; a magnetic layer 3 formed on the underlayer, including a ferromagnetic material, and formed by introducing a predetermined element to modify a surface layer portion; and a protective layer 4—1, formed in at least one area of an outer peripheral area and an inner peripheral area excluding a middle area held between the outer peripheral area and the inner peripheral area of a disk on the modified surface layer portion of the magnetic layer, for protecting the magnetic layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.