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Proceedings Paper

Anneal-less domain wall displacement detection of 15-Gbit/in2 land-groove recording using a deep groove substrate and a red laser
Author(s): Tetsuhiro Sakamoto; Yasuhito Tanaka; Shingo Imanishi; Motohiro Furuki; Nobuyuki Arakawa; Kazuhiko Fujiie
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Paper Abstract

Domain Wall Displacement Detection (DWDD) medium with no annealing method, which we call "anneal-less" DWDD medium, has been improved for practical use. The key technologies of our progress are not only an optimum design of the magnetic film structure but also a deep groove substrate for land-groove recording with a quite unique groove form. The substrate was prepared by using the mastering process with a reactive ion etching (RIE) method. We achieved 15 Gbit/in2-areal density with wide system tolerances using the anneal-less DWDD medium, a 660nm-laser and a 0.60 NA objective lens. The areal density corresponds to 4.7 GB-capacity on a disc like MiniDisc (MD) wiht a 64 mm-diameter.

Paper Details

Date Published: 16 September 2003
PDF: 8 pages
Proc. SPIE 5069, Optical Data Storage 2003, (16 September 2003); doi: 10.1117/12.532519
Show Author Affiliations
Tetsuhiro Sakamoto, Sony Corp. (Japan)
Yasuhito Tanaka, Sony Corp. (Japan)
Shingo Imanishi, Sony Corp. (Japan)
Motohiro Furuki, Sony Corp. (Japan)
Nobuyuki Arakawa, Sony Corp. (Japan)
Kazuhiko Fujiie, Sony Corp. (Japan)


Published in SPIE Proceedings Vol. 5069:
Optical Data Storage 2003
Michael O'Neill; Naoyasu Miyagawa, Editor(s)

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