Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1992-03-27
1993-08-17
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1304, G11B 1112, G11B 1110
Patent
active
052375480
ABSTRACT:
A magneto-optic recording structure is disclosed in which the magnetic recording layer is sandwiched between an opaque substrate and a magneto-optic layer structure. The magneto-optic recording structure comprises a substrate, a magnetic recording layer coated on the substrate and a magneto-optic layer structure coated on the magnetic recording layer. The arrangement of layers permits both the magnetic and magneto-optic layers to be addressed from the same side. The magnetic recording layer and the magneto-optic layer structure can be coated on both sides of the substrate, to make double-sided disks. The recording structure also allows the use of opaque substrates. An information recording and playback device based on the magneto-optic recording structure comprises a magnetic recording head disposed adjacent the magneto-optic layer adjacent the magneto-optic layer structure for recording and reading the magneto-optic active layer. A method for recording data on the magneto-optic layer. A method for recording data on the magneto-optic recording structure comprises the steps of recording data in the magnetic recording layer through the magneto-optic layer structure to produce a fringing magnetic field and then locally irradiating an area of the magneto-optic layer structure to raise the temperature of the area so that the area aligns itself with the fringing magnetic field.
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Hoechst Aktiengesellschaft
Nguyen Hoa T.
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