Magnetooptical recording medium having a bias layer related by Curie temperature to a writing layer, which is capable of being overwritten by light modulation
US5949743A · kind A · utility
3Cited by
17References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 10, 1996 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Oct 10, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10506
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetooptical recording medium has a stack of layers and is capable of being overwritten by light modulation. The recording medium has a writing layer in which information bits can be written, and a bias layer which generates a leaky magnetic field for writing information bits in the writing layer. The bias layer has a Curie temperature that is in the range of from (T.sub.2 -90.degree. C.) to (T.sub.2 +5.degree. C.), where T.sub.2 is the Curie temperature of the writing layer, and the bias layer has a saturation magnetization at ambient temperature that is at least 350 emu/cc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.