Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1996-06-17
1998-05-26
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
428694EC, G11B 1100, G11B 566
Patent
active
057577340
ABSTRACT:
A magneto-optical recording medium is composed of a reproducing layer, a recording layer, and an initializing layer, which are laminated in this order. The reproducing layer is provided so that a light beam is projected thereon so as to reproduce information. The recording layer is provided so that information is recorded therein and the information is copied to the reproducing layer at a readout temperature. The initializing layer is provided so that the reproducing layer is initialized at room temperature. Non-magnetic layers are provided between the reproducing layer and the recording layer and between the recording layer and the initializing layer, respectively, so that such two layers are not exchange-coupled each other. The recording layer has a compensation temperature of room temperature, while the initializing layer has a compensation temperature of the readout temperature, which is achieved by temperature rise caused by the projection of the light beam. With such an arrangement, an external magnetic field for initializing the reproducing layer and an external magnetic field for reproduction-use can be omitted, thereby preventing a recording device from becoming large in size, as well as enhancing the recording density of the recording layer.
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patent: 5648162 (1997-07-01), Hirokane et al.
patent: 5657299 (1997-08-01), Nakajima et al.
"Multilayered Magneto-Optical Disks for Magnetically Induced Superresolution" (M. Kaneko et al., Jpn. J. Appl. Phys. vol. 31 (1992) pp. 568-575 Part 1, No. 2B, Feb. 1992).
"Magnetically-Induced Super Resolution Using Magneto-Static Coupling" (K. Tamanoi et al., Proceedings of Magneto-Optical Recording International Symposium '94, J. Magn Soc. Jpn., vol. 19, Supplement No. S1 (1995), pp. 421-424).
Heisei, "Double-Sided Magneto-Optical Recording Medium Capable of Over-Writing and Production Thereof", Japanese Laid-Open Patent Publication, No. 6-338083, Published on Dec. 6, 1994.
Hirokane Junji
Murakami Yoshiteru
Nakajima Junsaku
Takahashi Akira
Conlin David G.
Daley, Jr. William J.
Neyzari Ali
Sharp Kabushiki Kaisha
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