System for recording patterns of magnetically recorded informati

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

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369110, 360114, 360 59, G11B 532, G11B 1110

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active

045584400

ABSTRACT:
A device for reading magnetically recorded patterns on a magnetic recording medium includes a first system for causing a light beam polarized in a predetermined direction to enter the recording medium, a second device for relatively varying the ratio of the polarized component in the predetermined direction and the polarized component in a direction perpendicular thereto, of the light of said light beam reflected or transmitted by the recording medium, and a third device including a photodetector and an amplifier for amplifying a detection signal, the third device being for detecting the light beam from the second means and reading the recorded patterns on the magnetic recording medium, the second device being set so that the SN ratio of the detection signal becomes maximum.

REFERENCES:
patent: 3969573 (1976-07-01), Bouwhuis et al.
patent: 4409631 (1983-10-01), Matsumoto
NHK Laboratories Note 285, Feb. 1983.
Chen et al., MnBi Films: Curie Point Writing, 1970, J. of Applied Physics, vol. 41, No. 6, 1970, pp. 2530-2534.

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