Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1988-01-20
1990-06-05
Stephan, Steven L.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, G11B 1112, G11B 1304
Patent
active
049320122
ABSTRACT:
There is disclosed a magnetooptical recording medium provided with at least a recording layer and a reading layer both composed of magnetic layers showing vertical magnetic anisotropy, in which the recording layer has a higher coercive force and a lower Curie temperature than those of the reading layer at room temperature, wherein the thickness of the recording layer is 1/10 to 1/1000 of the diameter of the magnetic domain formed in the recording layer by information recording, and the reading layer is so positioned with respect to the recording layer that a floating magnetic field emanating from the magnetic domain in the recording layer shows positive and negative peaks in the reading layer in the vicinity of the boundary of the magnetic domain. Secure regeneration of information with a high S/N ratio is possible from such recording medium by irradiating the reading layer with light while applying a magnetic field of which magnitude is larger than the coercive force of the reading layer, smaller than that of the recording layer and smaller than the peak value of the floating magnetic field emanating from the recording layer, and detecting the regenerating light modulated in polarization according to the direction of magnetization of the reading layer.
REFERENCES:
patent: 4518657 (1985-05-01), Yanagida
patent: 4628485 (1986-12-01), Tanaka et al.
patent: 4645722 (1987-02-01), Katayama et al.
patent: 4799114 (1989-01-01), Tsunashima
S. Tsunashima et al., Thermomagnetic Writing on Multilayered Amorphous Rare-Earth Iron Films, 5 Japan Applied Magnetics Scientific Journal 73 (1981).
T. Kobayashi, Treatise on Amorphous Rare-Earth Transition-Metal Alloy Films, and Magnetic and Magnetooptic Effects of That Multilayered Films (Nagoya Univ., 1985).
Takenonchi et al, "Magneto-Optical Characteristics of Double-Layered Amorphous RE-Fe Films by RF Sputtering" J. Appl. Phys. 55(6), 15 Mar. 1984, p. 2164.
Canon Kabushiki Kaisha
Nguyen Hoa T.
Stephan Steven L.
LandOfFree
Method for regenerating information from a magneto-optical infor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for regenerating information from a magneto-optical infor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for regenerating information from a magneto-optical infor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-497358