Proceedings PaperDirect overwritable magneto-optical exchange-coupled multilayered disk by laser power modulation recording
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In 1987, we presented a direct overwritable Magneto-Optical exchange coupled Multilayered (DOW) disk by laser power modulation recording. Since then two major improvements of DOW were announced, namely 3- layered and 4-layered DOW disks, based on the 2-layered DOW disk, From the view point of merits and demerits, we compare the DOW disk with other direct overwritable optical disks, magnetic field modulation recording type of MO disk and phase change type of optical disk. As a latest topic, the recording power margin of the DOW scheme is explained. Adding metal coat to the DOW MO thin films is effective to expand the recording power margin. We have achieved (+/- 10%)2 allowance for direct overwriting power margin of PH and PL. Perspectives of the DOW disk for the next generation MO disk memory system are mentioned.