MAGNETO-OPTICAL RECORDING MEDIUM

PURPOSE:To generate large enhancing effect, to increase Kerr rotation angle and to improve recording density by providing a dielectric film, magnetic film and reflecting film on a transparent substrate arranged at the incident side of light, and forming the dielectric layer with amorphous material c...

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Main Authors TAWARA YOSHIO, KASHIDA SHU, SHIMIZU YOSHIMASA, TOKUNAGA KATSUSHI, KUBOTA YOSHIHIRO, TAKAYA MASATERU, NOMURA TADAO
Format Patent
LanguageEnglish
Published 15.08.1991
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PURPOSE:To generate large enhancing effect, to increase Kerr rotation angle and to improve recording density by providing a dielectric film, magnetic film and reflecting film on a transparent substrate arranged at the incident side of light, and forming the dielectric layer with amorphous material composed of SiC and SiN. CONSTITUTION:On a transparent substrate 1 such as glass and polycarbonate resin formed with guide grooves for tracking, dielectric film 2, magnetic film 3, dielectric film 4 composed of the same material as the film 2, and reflecting film 5 are successively formed to constitute the magneto-optical recording medium. Light 6 incident on the substrate 1 is made to reflect by the film 5. In this constitution, the amorphous material for the films 2, 4 has such a molar composition ratio of SiC:SiN = 20 - 80 : 80 - 20 with Si:N = 0.6 - 1.34 of SiN. The refractive index of the amorphous material is specified to 1.70 - 2.30, and the amorphous material is formed by sputtering in gaseous Ar atmosphere. Thereby, thermal diffusion of laser beam can be reduced to prevent expanding of recording bit diameter.
Bibliography:Application Number: JP19890325208