Elimination of noise in the operation of a stress controlled mem

Details Elimination of noise in the operation of a stress controlled mem Elimination of noise in the operation of a stress controlled mem

1976-12-09

1980-01-22

Moffitt, James W.

Static information storage and retrieval

Read/write circuit

Differential sensing

365145, 365157, G11C 702

Patent

active

041853229

ABSTRACT:
Data can be stored in a 1,2, or 3-dimensional memory by lining up the permanent dipole of small particles using a superposition of ultrasonic pulses and applied fields. Signals due to dipole orientation changes in particles with lower coercive fields than the design coercive field may lead to a large "noise" signal which disturbs the readout. This "noise" signal can be eliminated by applying a field with or without stress to the sample which lines up all dipoles with too low coercive fields. Afterwards the standard procedure to "read" the memory is used, which is undisturbed by the "noise" due to flipping of dipoles with too low coercive fields, if the field applied during "reading" is parallel to the field used to flip particles with too low critical fields.

REFERENCES:
patent: 3535686 (1970-10-01), Barnett
patent: 3890604 (1975-06-01), Schroder
patent: 4031525 (1977-06-01), Volz et al.

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