Magneto-optical medium and process for production thereof
US6221219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1999 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Sep 27, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24942
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical medium comprises a light-transmissive substrate, a third magnetic layer formed on the light-transmissive substrate, a first magnetic layer formed on the light-transmissive substrate, the first magnetic layer having lower domain wall coercivity and allowing higher domain wall mobility than the third magnetic layer at or around an ambient temperature and a second magnetic layer held between the first magnetic layer and the third magnetic layer, the second magnetic layer having a Curie temperature lower than that of the first magnetic layer and the third magnetic layer, wherein the surface roughness, Ra(d), of the first magnetic layer is smaller than the surface roughness, Ra(m), of the third magnetic layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.