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14 January 1987 New Erasable Optical Media Using Sb-Se-Bi Alloy Film
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Antimony-Selenium alloy film with Bismuth has good characteristics for erasable optical disk media. The mechanism of the reversible change is phase transition between amorphous and crystalline states. It is confirmed by small-angle X-ray diffraction analysis that Se-Bi component plays an important role in this reversible change. The minimum erase time is 1 μs. The film has high transition temperature and activation energy of crystallization. It has a long life span of written spots in amorphous state. Recording film of Sb-Se-Bi alloy is formed on 20 cm 0 PMMA substrate and is covered with protective films. The disk samples are written and erased at a speed of 1800 rpm, using an optical head with two diode laser beams. Carrier-to-Noise ratio is more than 55 dB at 5 MHz, 30 KHz bandwidth. The newly developed disk realized high performance and durability for the use of an erasable video file system.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Ishigaki, N. Tokushuku, T. Ohishi, Y. Kodera, Y. Ohta, and Y. Fukui "New Erasable Optical Media Using Sb-Se-Bi Alloy Film", Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987);


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