Partially-oxidized cap layer for hard disk drive magnetic media
US7998607B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2009 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Aug 21, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular recording magnetic media with a partially-oxidized cap layer combines a second oxide layer with a first cap layer to form the singular, partially-oxidized cap. The oxidized portion and the non-oxidized portion of the partially-oxidized layer are sputtered from a same target and have a same composition of metallic elements. The Ms of the oxidized portion is about twice as high as the non-oxidized portion. The oxidized portion has a thickness in the range of about 5 to 25 angstroms. The layer composition may comprise CoPtCrBTa, with a Cr at % of about 18-24%, Pt at about 13-20%, B at about 4-10%, and Ta at about 0-2%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.