Magneto-optical recording medium and method for reading out information from the same
US5814418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1995 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Sep 26, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, the magneto-optical recording medium of the present invention has a recording layer structure including at least a readout magnetic film, a control magnetic film, and a recording magnetic film. The readout magnetic film is a perpendicular magneto-anisotropy film at a temperature in a predetermined range. The control magnetic film provided between the readout magnetic film and the recording magnetic film has a prescribed structure so as to assume a perpendicular magneto-anisotropy film at a temperature in a predetermined range and an in-plane magneto-anisotropy film at a temperature in a range other than the predetermined range. By irradiating the medium with a readout light, information recorded as a magnetized direction of a domain on the recording magnetic film is copied onto the readout magnetic film through the control magnetic film by an exchange-coupled force in a region whose temperature allows both of the readout magnetic film and the control magnetic film to be perpendicular magneto-anisotropy films. The thus copied information is read out by utilizing the magneto-optical effect of reflected readout light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.