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Proceedings Paper

Non-bias magneto-optical recording
Author(s): Tsutomu Shiratori; Toshimori Miyakoshi; Yasuyuki Miyaoka; Yasushi Hozumi
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Paper Abstract

Without applying an external magnetic field, high-density recording beyond the optical resolution limit was realized with light intensity modulation, using Domain Tail Erasing (DTE) and Domain Wall Displacement Detection (DWDD). In order to obtain a sufficiently strong bias field to perform recording with a bias layer introduced into the DTE medium, the stray field distribution during the recording process was studied by simulation. A stray field most effectively worked on the recording layer when the Curie temperature of the bias layer was designed at a certain level below the recording temperature. Furthermore, by replacing a part of the bias layer with a bias assist layer, which had a higher Curie temperature and lower coercive force, an even stronger stray field was generated. According to the simulation, non-bias DTE medium was designed, and as a result a sufficiently low jitter value and dropout rate were obtained without bias magnets at a bit length of 80 nm and a track pitch of 0.74 μm, using the same optical parameters of a current DVD.

Paper Details

Date Published: 9 September 2004
PDF: 8 pages
Proc. SPIE 5380, Optical Data Storage 2004, (9 September 2004); doi: 10.1117/12.567965
Show Author Affiliations
Tsutomu Shiratori, Canon Inc. (Japan)
Toshimori Miyakoshi, Canon Inc. (Japan)
Yasuyuki Miyaoka, Canon Inc. (Japan)
Yasushi Hozumi, Canon Inc. (Japan)

Published in SPIE Proceedings Vol. 5380:
Optical Data Storage 2004
B. V. K. Vijaya Kumar; Hiromichi Kobori, Editor(s)

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