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Proceedings Paper

High-density magneto-optical disk using domain wall displacement detection
Author(s): Masahiko Kaneko; Tetsuhiro Sakamoto
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Paper Abstract

Domain wall displacement detection (DWDD) is the promising method for achieving very high-density magneto-optical disk. The resolving power can be expanded far beyond the optical limit which is determined by the light wavelength and the numerical aperture of the objective lens. Some technologies have been introduced to ensure the smooth wall motion which is the key to the high performance of DWDD. Very smooth surface is obtained by pretreatment of the substrate or by reactive ion etching process on a glass master. Reverse disk rotation for readout is effective in reducing the jitter because the front line for starting position of the wall displacement curves to the same direction as recorded crescent domains. A possibility of an areal density of 20 Gb/in2 has been shown for the DWDD media using a blue-violet laser diode and a numerical aperture of 0.6.

Paper Details

Date Published: 9 April 2003
PDF: 8 pages
Proc. SPIE 5060, Sixth International Symposium on Optical Storage (ISOS 2002), (9 April 2003); doi: 10.1117/12.510140
Show Author Affiliations
Masahiko Kaneko, Sony Corp. (Japan)
Tetsuhiro Sakamoto, Sony Corp. (Japan)

Published in SPIE Proceedings Vol. 5060:
Sixth International Symposium on Optical Storage (ISOS 2002)
Fuxi Gan; Zuoyi Li, Editor(s)

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