Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1996-02-02
1998-07-14
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369100, G11B 1100
Patent
active
057815135
ABSTRACT:
A magneto-optical recording medium has a recording layer on which information is recorded and an auxiliary layer magnetic-coupled with the recording layer. A recording magnetic field whose direction is reversed between upward and downward directions according to the recording information is applied while irradiating a laser beam on the magneto-optical recording medium so that the center of the irradiated region becomes a high-temperature portion and the periphery of the high-temperature portion becomes a medium-temperature portion whose temperature is lower than the temperature of the high-temperature portion. On the recording layer, a direction of magnetization in the high-temperature portion of the irradiated region is recorded according to the direction of the recording magnetic field, while a direction of magnetization in the medium-temperature portion is recorded in the initialized direction irrespectively of the direction of the recording magnetic field. This structure prevents residual information from remaining on both sides of a recording mark after overwriting, and achieves an improved S/N ratio during reproduction.
REFERENCES:
patent: 4982396 (1991-01-01), Yasuoka et al.
patent: 5295121 (1994-03-01), Sukeda et al.
patent: 5329408 (1994-07-01), Fuji
patent: 5420836 (1995-05-01), Machida
patent: 5428594 (1995-06-01), Izumi et al.
patent: 5461595 (1995-10-01), Machida
patent: 5469422 (1995-11-01), Sohmuta
patent: 5475657 (1995-12-01), Sato et al.
"High Density Overwriting in Exchange-Coupled Magneto-Optical Multilayer Films" (Y. Nakaki et al, IEEE Transactions On Magnetics, vol. 28 No. 5, Sep. 1992, pp.2509-2511.
Neyzari Ali
Sharp Kabushiki Kaisha
LandOfFree
Magnetic-field modulation recording method and device for preven does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic-field modulation recording method and device for preven, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic-field modulation recording method and device for preven will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1890186