Magneto-optical recording medium having two reproduction layers and a method for reproducing thereof
US5633838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1996 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Jan 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10586
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A non-magnetic intermediate layer is provided between a reproductive layer and a recording layer. The reproductive layer is composed of a first reproductive layer and a second reproductive layer. When the first reproductive layer has a temperature that is higher than a first critical temperature, its stable magnetic domain width becomes smaller than a recording magnetic domain width so that the magnetization is reversed. When the second reproductive layer has a temperature that is higher than a second critical temperature, its stable magnetic domain width becomes larger than the recording magnetic domain width so that the reversed magnetic domain is collapsed. The first critical temperature is lower than the second critical temperature. A reproductive output having abrupt rising and falling can be obtained by the generation and the collapse of the reverse magnetic domain on the reproductive layer. For this reason, higher density recording required for larger capacity can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.