Magnetic recording media with a nialox sub-seedlayer
US6346339B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1999 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Aug 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73921
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Magnetic recording media exhibiting enhanced SMNR are formed with an NiAlOx sub-seedlayer for microstructural control of the underlayer to enable deposition and growth of a magnetic layer exhibiting a (10{overscore (1)}0)-predominant crystallographic orientation and small, uniform grain size. Embodiments include completely reactive sputter depositing a NiAlOx sub-seedlayer on a glass-ceramic substrate and sequentially depositing thereon a NiAl seedlayer, a Cr or Cr-alloy underlayer, e.g., CrMo, a Co—Cr magnetic layer and a protective overcoat, e.g., carbon. The resulting magnetic recording media exhibit a high SMNR, high OW, narrow PW50, improved jitter and improved Hr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.