Magnetic recording medium, manufacturing method thereof, and magnetic recording/reproducing device
US8628866B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2009 |
| Grant date | Jan 14, 2014 |
| Priority date | — |
| Expiry date | Dec 26, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/851
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium that is capable of realizing both high magnetic permeability and antiferromagnetic coupling for a soft magnetic underlayer. Namely, a magnetic recording medium including at least a non-magnetic substrate on which is laminated a soft magnetic underlayer formed by antiferromagnetic coupling of a plurality of soft magnetic layers, and a perpendicular magnetic layer for which the axis of easy magnetization is oriented mainly perpendicularly to the non-magnetic substrate, wherein the soft magnetic layers contain Fe as a first main component, Co as a second main component, and also contain Ta, the soft magnetic underlayer is antiferromagnetically coupled using the second peak or a subsequently appearing peak of the antiferromagnetic coupling force, which changes according to the thickness of a spacer layer sandwiched between the plurality of soft magnetic layers, and the magnetic permeability of the soft magnetic underlayer is not less than 1,000 H/m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.