Magneto-optical recording medium having first and second magnetic layers
US5420833A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1993 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Nov 17, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10586
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical recording medium is composed of a first magnetic layer and a second magnetic layer, which are overlaid, each having a perpendicular magnetic anisotropy, and the first magnetic layer having a Curie temperature of Tc.sub.1, a saturation magnetization of Ms.sub.1, a coercive force of Hc.sub.1, and a thickness of t.sub.1, the second magnetic layer having a compensation temperature of Tcomp.sub.2, a Curie temperature Tc.sub.2, and a coercive force of Hc.sub.2, and which satisfies the relationships: EQU Troom<Tc.sub.1 <Tcomp.sub.2 <Tc.sub.2 EQU Hc.sub.1 >Hc.sub.2 EQU Hc.sub.1 >.sigma.w/2Ms.sub.1 t.sub.1 wherein Troom is room temperature, and .sigma.w is the interface wall energy between the first magnetic wall and the second magnetic wall, and a magneto-optical recording method using this magneto-optical recording medium is provided, in which the application of a magnetic field for initialization of the magneto-optical recording medium is not required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.