Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1989-01-31
1994-03-15
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
G11B 1110
Patent
active
052951219
ABSTRACT:
A magneto-optic recording medium in which a vertically magnetized film on which magnetized domains are recorded by applying a light beam and an outer magnetic field is provided along a recording track and structure bands which do not contribute to read out of the magnetized domains are provided on both sides of the recording track so that the magnetization state of the magnetized domains recorded on the vertically magnetized film is read from an area limited by the width of the recording track. By scanning the magneto-optic recording medium along the recording track with a light beam having a diameter larger than the width of the recording track so as to heat an area larger than the width of the recording track to a temperature exceeding the curie temperature of the vertically magnetized film and also by applying a magnetic field in a predetermined direction to the area irradiated with the light beam, the magnetized domains are recorded in accordance with the direction of the applied magnetic field, and the magnetization state of the magnetized domains is read out only from the area limited by the width of the recording track through the magneto-optic effect.
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Proc. Int. Symp. on Optical Memory, 1987 Japanese Journal of Applied Physics, vol. 26 (1987) Supplement 26-4.
Kato Keizo
Sukeda Hirofumi
Hitachi , Ltd.
Levy Stuart S.
Watkins Kevin M.
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