Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1993-12-30
1994-10-18
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 365122, G11B 1112, G11B 1304
Patent
active
053574940
ABSTRACT:
A magneto-optical playback method employing a magneto-optical recording medium having a playback magnetic layer, a recording magnetic layer, a transparent dielectric layer and a reflecting layer. The playback magnetic layer is so formed that its playback output R.times..theta..sub.k (in which R and .theta..sub.k represent the reflectivity and the Kerr rotation angle of the recording medium, respectively) is sufficiently small at any point lower than a threshold temperature T.sub.th at which the magnetization thereof is inverted. According to this method, a playback output is obtained by inverting the magnetization of merely the playback magnetic layer alone in a playback mode, thereby achieving ultrahigh-density recording with enhanced linear density (recording density on record tracks) and transverse-to-track density while improving the playback signal-to-noise ratio.
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Nguyen Hoa T.
Sony Corporation
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