Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1986-02-20
1989-04-25
Faber, Alan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 365122, G11B 1114, G11B 1304
Patent
active
048254282
ABSTRACT:
An apparatus and a method for recording, reading and erasing information, which use, as a recording medium, a magnetic film having vertical magnetic anisotropy characteristics and record, read and erase information by means of a laser beam and an external magnetic field applied to the magnetic medium. These are characterized in that the application of the external magnetic field to the recording medium is controlled by controlling the magnetic field provided by a permanent magnet put at a predetermined distance from the recording medium. For controlling the magnetic field, means for applying an external magnetic field to a recording medium is employed, which comprises a permanent magnet, a magnetic core of a high magnetic permeability material comprising a pole piece attached to at least one pole of the permanent magnet and a lag piece integrally connected to the pole piece and having a wire wound therearound, and an electric current source supplying electric current to the wire wound of the core.
REFERENCES:
patent: 1828190 (1931-10-01), Kilini
patent: 3624623 (1971-11-01), Breton, Jr.
patent: 4558440 (1985-12-01), Tomita
patent: 4610009 (1986-09-01), Connell
Faber Alan
NEC Corporation
Nguyen Hoa T.
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