Method of producing magnetic recording medium
US6773745B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2002 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Aug 14, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of producing a magnetic recording medium comprising the step of forming a magnetic layer on a non-magnetic base film running at a constant speed by continuous oblique evaporation depositing metal vapor of volatilized metal incident obliquely to a surface of the non-magnetic base film, wherein the evaporation is conducted at a film forming rate, defined as an average deposition rate of the magnetic layer at a part of the non-magnetic base film exposed to the incident metal vapor, of not less than a predetermined rate to form an internal microstructure of the magnetic layer comprising columns each having a diameter of not more than about 15 nm constituted by magnetic particles having a size of not more than about 10 nm connected in chains in a direction substantially perpendicular to the magnetic layer and non-magnetic particles packed between the columns and separating the columns from each other, and a magnetic recording medium produced by the above method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.