Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus using the same
US8771849B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2008 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Oct 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7379
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.