Direct overwritable magneto-optical exchange-coupled multilayered disk by laser power modulation recording

Jun Saito; Hideki Akasaka

doi:10.1117/12.45947

1 July 1991 Direct overwritable magneto-optical exchange-coupled multilayered disk by laser power modulation recording

Jun Saito, Hideki Akasaka

Proceedings Volume 1499, Optical Data Storage '91; (1991) https://doi.org/10.1117/12.45947
Event: Optical Data Storage, 1991, Colorado Springs, CO, United States

Abstract

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 P_H and P_L. Perspectives of the DOW disk for the next generation MO disk memory system are mentioned.

Citation Download Citation

Jun Saito and Hideki Akasaka "Direct overwritable magneto-optical exchange-coupled multilayered disk by laser power modulation recording", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); https://doi.org/10.1117/12.45947

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