Multilayer films for optimized soft underlayer magnetic properties of dual layer perpendicular recording media
US6777113B2 · kind B2 · utility
11Cited by
14References
17Claims
0Family size
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Key dates
| Filing date | Apr 4, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Apr 4, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31833
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording medium includes a hard magnetic recording layer and a soft magnetic underlayer adjacent the hard magnetic recording layer. The soft magnetic underlayer includes first and second ferromagnetically coupled multilayer structures and a coupling layer positioned between the first and second multilayer structures for antiferromagnetically coupling the first and second multilayer structures. A magnetic disc drive storage system incorporating such a perpendicular magnetic recording medium and a method of making such a perpendicular magnetic recording medium are also included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.