High density magnetic recording media
US7465501B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2004 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Mar 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7377
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr<16 at % and Ta<6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has <10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.