表面記録方式光磁気ディスク

概要

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We developed a conventional magneto-optical (MO) medium for the first surface magneto-optical (FSMO) recording that has a land and groove structure with a track pitch of 0.265μm and groove depth of about 50 nm. The first surface recording was performed on this medium, using magnetic field modulation and a blue laser optical system equipped with a high-NA objective lens. Disk noise related to reverse stacking of layers was greatly reduced by optimizing the production process for the substrate and the heat sink layers, and a practical level CNR was obtained. Bit error rate measurements were conducted assuming NRZI code and Turbo decording, and a possible power margin of 16.5 Gbit/in^2 areal density was confirmed. This result indicates a possible capacity of 10 GB for a 3.5-inch disk or 25 GB for a 5.25-inch disk.
社団法人日本磁気学会の論文
2004-03-01