Magnetooptical recording medium and method of producing the same
US6096446A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 24, 1998 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Sep 24, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To obtain a magnetooptical recording medium with a magnetooptic effect suitable for ultraviolet radiation, x-layers and y-layers are sequentially laminated on a glass substrate, where x is a TbFeCo layer and y is a Pt or NdCo layer. This multilayer thin film structure can provide a hysteresis loop of a rectangular ratio 1 because a vertical magnetic anisotropic constant Ku is larger than a demagnetizing energy of 2.pi.Ms.sup.2 (where M is a saturated magnetization). FOM (Figure of Merit)=R.sqroot. [.theta..sub.k.sup.2 +.eta..sub.k.sup.2 ] where .theta..sub.k is a Kerr rotation angle and .eta..sub.k is a Kerr ellipticity) is 0.05 or more in the range of ultraviolet rays (of a wavelength of 400 nm or less).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.