Magnetic disk with specified contact ratio [BH 1.0 nm] and circumferential texturing and magnetic disk apparatus equipped with magnetic disk
US7239483B2 · kind B2 · utility
2Cited by
3References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 26, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Oct 1, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A texture processing for imparting a magnetic orientation in the circumferential direction is applied to a substrate so as to impart a magnetic anisotropy to the magnetic disk in the circumferential direction. An underlying film, a magnetic recording film, a protective film, and a lubricating film are laminated one upon the other on the surface of the substrate. The surface of the magnetic disk has a value of the contact ratio [BH 1.0 nm] falling within a range of 7% to 15% in a region having a height not smaller than 1.0 nm, based on the height at which the contact ratio in the bearing curve of a surface roughness is 50%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.