Thermally assisted magnetic recording disk with ion-implant facilitated non-magnetic regions, manufacturing method thereof, and magnetic recording method
US8634155B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2011 |
| Grant date | Jan 21, 2014 |
| Priority date | — |
| Expiry date | Oct 10, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/855
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a magnetic disk that solves (1) a problem of cross-talk that cannot be solved even by an existing thermally assisted recording method or a discrete method (DTM or the like), (2) a problem of surface flatness, which an existing embedding type DTM or the like has, and (3) a problem of a difference in thermal expansion coefficient between materials when a thermally assisted method is applied to the DTM, and that (4) does not necessitate a special medium structure, and is excellent in a surface flatness and economically and functionally high in realizability. A DTM manufactured by ion implantation is excellent in the surface flatness, and can solve the cross-talk problem by conducting the thermally assisted recording at a temperature between a Curie temperature (Tcn) of a portion where ions are implanted (non-recording region) and a Curie temperature (Tcr) of a portion where ions are not implanted (recording region).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.