MAGNETO-OPTICAL RECORDING MEDIUM

• Main Authors: TAWARA YOSHIO, SHIMIZU YOSHIMASA, TOKUNAGA KATSUSHI, TAKAYA MASATERU, KANEKO HIDEO, SAKAGUCHI ARATA, NOMURA TADAO
• Format: Patent
• Language: English
• Published: 08.05.1992
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PURPOSE:To increase a recording speed so as to allow high-degree recording and to improve a writing speed and to increase a performance index so as to improve productivity by constituting a dielectric film of any SiC, SiN, BN, and SiCN contg. hydrogen. CONSTITUTION:A recording film b, the dielectric film c and a reflection film 3 are successively superposed on a substrate a. This film c is constituted of any among the SiC, SiN an BN contg. the hydrogen, by which the film c having the small thermal conductivity is formed. Then, the recording sensitivity of the medium is increased and the use of a semiconductor laser of low output and short wavelength which is heretofore not usable is made usable and, therefore, the recording at a higher density is possible. The writing speed is increased in the high-speed rotation of a disk and further this medium is made of a three- layered structural body, the reflectivity is increased while a large Kerr rotating angle is maintained. The magneto-optical recording medium having the high performance index is formed in this way and since the man-hours for film formation is smaller as compared with the four-layered structural body and, therefore, the productivity is improved.