Optical information recording medium comprising two magneto-optical layers which are made of GDFECO and TBFETI, respectively
US5362537A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Mar 30, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For use in recording information by an irradiation of a laser beam, an optical information recording medium comprises a substrate transparent for the laser beam and a first and a second magneto-optical layer which are made of GdFeTi and TbFeCo, respectively. The first magneto-optical layer is between the substrate and the second magneto-optical layer and thermally coupled to the second magneto-optical layer. For carrying out a recording operation, the laser beam is irradiated to the substrate to heat the first magneto-optical layer. A temperature of the first magneto-optical layer is transferred to the second magneto-optical layer. In this condition, the second magneto-optical layer is subjected to a magnetic field representative of information. As a result, the information is recorded as recorded information to the second magneto-optical layer. The recorded information is transferred from the second magneto-optical layer to the first magneto-optical layer with decreasing of the temperature of the first magneto-optical layer. The recorded information can be read from the first magneto-optical layer in the manner known in the art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.