Parametric bubble detector

Details Parametric bubble detector Parametric bubble detector

1979-11-26

1981-07-21

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Detectors

365173, G11C 1908

Patent

active

042801940

ABSTRACT:
A parametric bubble detector contains a coupled film sensor stripe and an excitation conductor which, electrically insulated from each other, cross at right angles. A sensor stripe consists of a pair of superpositioned Permalloy stripes which are separated by a thin nonmagnetic layer. A high frequency excitation current in the conductor produces an inductive output signal in the sensor stripe. The waveform of this periodic signal is responsive to bubble domains proximate to the sensor/conductor crossover area.

REFERENCES:
patent: 3497713 (1970-02-01), Davis
patent: 3633188 (1972-01-01), Bittman
patent: 3691540 (1972-09-01), Almasi et al.
patent: 3736419 (1973-05-01), Almasi et al.
patent: 3829894 (1974-08-01), Watanbe et al.
patent: 3842407 (1974-10-01), Argyle et al.
patent: 3860965 (1975-01-01), Voegeli
patent: 4048557 (1977-09-01), Chen
patent: 4137554 (1979-01-01), McClure
patent: 4177521 (1979-12-01), Schaefer

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