Magneto-optical recording medium capable of super resolution reproduction and information reproduction method using the same
US5790513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Apr 12, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10515
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical recording medium includes a first magnetic layer which becomes an in-plane magnetization film at room temperature, and a perpendicular magnetization film at a temperature between room temperature and the Curie temperature of the layer, a second magnetic layer which has a Curie temperature lower than the Curie temperature of the first magnetic layer, remains a perpendicular magnetization film from room temperature to its Curie temperature, and is stacked on the first magnetic layer, and a third magnetic layer which is arranged between the first and second magnetic layers and has a Curie temperature lower than the Curie temperatures of the first and second magnetic layers. The first magnetic layer is magnetostatically coupled with the second magnetic layer in a region where the temperature of the third magnetic layer has reached the Curie temperature or more. An information reproduction method of reproducing information from the medium is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.