Anneal-less domain wall displacement detection of 15-Gbit/in2 land-groove recording using a deep-groove substrate and a red laser

Tetsuhiro Sakamoto; Yasuhito Tanaka; Shingo Imanishi; Motohiro Furuki; Nobuyuki Arakawa; Kazuhiko Fujiie

doi:10.1117/12.532519

16 September 2003 Anneal-less domain wall displacement detection of 15-Gbit/in² land-groove recording using a deep groove substrate and a red laser

Tetsuhiro Sakamoto, Yasuhito Tanaka, Shingo Imanishi, Motohiro Furuki, Nobuyuki Arakawa, Kazuhiko Fujiie

Author Affiliations +

Proceedings Volume 5069, Optical Data Storage 2003; (2003) https://doi.org/10.1117/12.532519
Event: Optical Data Storage 2003, 2003, Vancouver, Canada

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.

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Tetsuhiro Sakamoto, Yasuhito Tanaka, Shingo Imanishi, Motohiro Furuki, Nobuyuki Arakawa, and Kazuhiko Fujiie "Anneal-less domain wall displacement detection of 15-Gbit/in² land-groove recording using a deep groove substrate and a red laser", Proc. SPIE 5069, Optical Data Storage 2003, (16 September 2003); https://doi.org/10.1117/12.532519

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