Directly overwritable magneto-optical disk with light-power-modulation method using no initializing magnet

Kazuhiko Tsutsumi; Yoshiyuki Nakaki; T. Fukami; T. Tokunaga

doi:10.1117/12.45949

1 July 1991 Directly overwritable magneto-optical disk with light-power-modulation method using no initializing magnet

Kazuhiko Tsutsumi, Yoshiyuki Nakaki, T. Fukami, T. Tokunaga

Proceedings Volume 1499, Optical Data Storage '91; (1991) https://doi.org/10.1117/12.45949
Event: Optical Data Storage, 1991, Colorado Springs, CO, United States

Abstract

Direct overwrite technology by light power modulation using only a conventional bias magnet on a magneto-optical (MO) disk with exchange coupled rare-earth transition metal (RE-TM) quadrilayered film is described. This film consists of a 'memory layer', a 'writing layer', a 'switching layer' and an 'initializing layer'. The initializing layer is used to initialize the writing layer and the switching layer is used to switch off the coupling between the writing layer and the initializing layer above the Curie temperature of the switching layer. These two layers have made direct overwrite with only a conventional bias magnet possible. Good recording characteristics were obtained, such as CNR > 48 dB on a bit length equals 0.76 micrometers without a residual signal. The most important advantage of this technology is its capability for direct overwriting with hardly any change in the conventional MO disk drive construction.

Citation Download Citation

Kazuhiko Tsutsumi, Yoshiyuki Nakaki, T. Fukami, and T. Tokunaga "Directly overwritable magneto-optical disk with light-power-modulation method using no initializing magnet", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); https://doi.org/10.1117/12.45949

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