Perpendicular magnetic recording medium for high density recording and manufacturing of the same
US7641989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2005 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Jul 16, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7379
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Embodiments of the invention provide a medium which provides high media S/N and good corrosion resistance. According to one embodiment, in a perpendicular magnetic recording medium at least comprising a soft-magnetic underlayer, a seed layer, an intermediate layer, a magnetic recording layer and an overcoat layer which are stacked over a substrate in order, the magnetic recording layer has a granular structure which consists of many columnar grains of CoCrPt alloy and a grain boundary layer containing an oxide, the seed layer is made of TaNi alloy or TaTi alloy and the intermediate layer is made of Ru or Ru alloy which contains about 80 at. % Ru or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.