Magneto-optical recording device with three distinct layers
US6430115B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1999 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Aug 31, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10586
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reproducing layer having perpendicular magnetization in a single layer, an in-plane magnetic layer, and a recording layer having perpendicular magnetization are formed in this order. When the reproducing layer, the in-plane magnetic layer, and the recording layer have the Curie temperatures of Tc1, Tc2, and Tc3, these values satisfy conditions of Tc2<Tc1 and Tc2<Tc3. The reproducing layer has in-plane magnetization due to an exchange coupling with the in-plane magnetic layer at lower than Tc2. At Tc2 or higher, magnetization information is expanded and transferred from the recording layer to the reproducing layer, so that the reproducing layer has single-domain perpendicular magnetization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.