Magnetic recording medium
US9311946B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2011 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Oct 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7356
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.