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Proceedings Paper

High Quality Magneto-Optical Disk
Author(s): A. Takahashi; H. Katayama; T. Inui; K. Ohta; H. Yamaoka
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Paper Abstract

The effect of the groove profile on the characteristic properties of a magneto-optical (MO) disk with a quadrilayer structure (A1N/GdTbFe/A1N/A1) prepared on a glass substrate was investigated, using a micro Kerr-effect measuring apparatus. Taking a diffraction effect into account, we have calculated the dependence of signal quality on the groove profile, being in agreement with experiments. The carrier to noise ratio reaches to 51 dB at high recording density where the bit length is 1.0 μm. In order to obtain a better understanding of the reliability of the MO disk, the MO disks were exposed to various environments with respect to temperatures and humidities. Though the readout signals of recorded bits do not change after the aging tests, the recording sensitivity is reduced slightly after exposing at high temperatures. Therefore, the lifetime of the MO disk depends upon the stability of recording sensitivity and was evaluated as about 18 years using the Arrhenious equation.

Paper Details

Date Published: 14 January 1987
PDF: 7 pages
Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987); doi: 10.1117/12.936818
Show Author Affiliations
A. Takahashi, Sharp Corporation (Japan)
H. Katayama, Sharp Corporation (Japan)
T. Inui, Sharp Corporation (Japan)
K. Ohta, Sharp Corporation (Japan)
H. Yamaoka, Sharp Corporation (Japan)


Published in SPIE Proceedings Vol. 0695:
Optical Mass Data Storage II
Robert P. Freese; Albert A. Jamberdino; Maarten R. de Haan, Editor(s)

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