PRODUCTION OF MAGNETO-OPTICAL RECORDING MEDIUM

摘要

PURPOSE:To take advantage of the performance characteristics intrinsic to a magnetic layer and to improve long-term reliability by subjecting the surface of a transparent dielectric film to adequate etching and presputtering and forming a recording layer thereon simultaneously with the end thereof. CONSTITUTION:A layer 3 consisting of silicon nitride and aluminum nitride is formed on a disk-shaped transparent substrate 4. The surface of the dielectric film is subjected to high-frequency etching at and for adequate power and time and is simultaneously subjected to the presputtering at and for adequate power and time by using the sputtering target used at the time of forming the recording layer just before the formation of the amorphous alloy recording layer 2 essentially consisting of a rare earth-transition metal. The recording layer 2 is formed simultaneously with the end thereof. Best use can be thereby made of the performance and characteristics intrinsic to the magnetic rare earth- transition metal and the CN is improved by 4-5dB. The long-term reliability is thereby improved.