Apparatus and method for writing and reading digital information

Details Apparatus and method for writing and reading digital information Apparatus and method for writing and reading digital information

1991-03-22

1996-09-03

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 14, 369 15, 365160, 505100, G11B 1110

Patent

active

055530362

ABSTRACT:
An apparatus and a method for writing and reading digital information on a magnetic memory are disclosed. In the apparatus, no mechanical contact between the memory and a magnetic detection means is made because the magnetic state of a respective domain is detected by detecting change of the whole magnetic fluxes induced by entire domains formed on the memory. The writing and reading operation are carried out by scanning the domain with beam irradiation in order to destruct superconductivity or ferromagnetic characteristics of the domain resulting in trapping or releasing of magnetic fluxes. The change in magnetic flux is detected by the detection means.

REFERENCES:
patent: 3413055 (1968-11-01), Sorbo
patent: 3691539 (1972-09-01), Erban et al.
patent: 5070070 (1991-12-01), Askew et al.
patent: 5270290 (1993-12-01), Yoshimura et al.
patent: 5377141 (1994-12-01), Takemura

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