Magneto-optical recording media and overwrite recording method u

Details Magneto-optical recording media and overwrite recording method u Magneto-optical recording media and overwrite recording method u

1991-11-21

1993-11-16

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, 3692752, G11B 700

Patent

active

052630153

ABSTRACT:
According to this invention, since the range of power necessary for erasing an overwritable magneto-optical recording medium is set to 2.5 mW or above, overwriting is possible without erase residue due to mark (magnetic domain) diameter difference, tracking offset, ambient temperature variation and characteristic dispersion between magneto-optical recording media and thus the magneto-optical recording medium has high reliability. Moreover, the rate of change, K of the switching field of the memory layer relative to temperature at around an erase start temperature can be controlled to be a constant value so that an erase power margin can be increased and that the tolerance to the reading light when the ambient temperature rises can be improved.

REFERENCES:
patent: 4939717 (1990-07-01), Ohno et al.
patent: 5025439 (1991-06-01), Komaki et al.
patent: 5123007 (1992-06-01), Miyauchi et al.
Iida et al. "Recording Power Characteristics of 130 mm Overwritable MO Disk by Laser Power Modulation Method" Japanese Journal of Applied Physics, vol. 28 (1989), pp. 367-370.
Mutoh et al. "Study for the Intermediate Layer in Magnetic Triple Layer File for Overwriting by Light Intensity Modulation" 10pF- 6, 14th scientific lecture of the Japan Society of Applied Magnetism (1990) (1990) p. 376.

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