Magnetic recording medium comprising a cobalt-samarium magnetic alloy layer and method
US6045931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1997 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Sep 3, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a cobalt-samarium magnetic alloy layer is formed having a high aerial recording density and exhibiting high coercivity, utilizing an underlayer with a thin nucleation layer thereon. Embodiments include sputter depositing a Cr or Cr alloy underlayer on a non-magnetic substrate, including alternative substrates, and sputter depositing a thin nucleation layer comprising Cr or a Cr alloy on the underlayer. A CoSm alloy layer is sputter deposited on the nucleation layer under substantially the same inert gas pressure as the nucleation layer, whereby Cr diffuses from the nucleation layer into and alloys with the CoSm magnetic alloy layer, thereby increasing media coercivity and corrosion resistance, and reducing media noise. A Cr overcoat on a CoSm alloy layer greatly reduces the oxidation of CoSm, thereby improving its corrosion resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.