Magnetic recording medium having novel underlayer structure
US7179549B2 · kind B2 · utility
72Cited by
10References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2004 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Sep 24, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/676
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium constructed in accordance with the invention comprises a substrate, first, second and third underlayers formed over the substrate, and a magnetic data recording layer formed over the underlayers. The underlayers typically have a bcc crystal structure, and comprise Cr or Cr alloys. The magnetic data recording layer has a hcp crystal structure and comprises a Co alloy. The second underlayer typically comprises a material such as B, which tends to reduce the crystal size of the second underlayer and the layers deposited thereon, and also to increase crystal spacing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.