Magnetic bubble detector

Details Magnetic bubble detector Magnetic bubble detector

1975-04-03

1976-11-02

Moffitt, James W.

Communications: electrical

Digital comparator systems

340174YC, G11C 1114

Patent

active

039900592

ABSTRACT:
A magnetic bubble detector comprising a planar layer of magnetic material in which magnetic bubble domains can be moved and a thin planar film on one surface of that layer. The layer has a magnetization perpendicular to the plane of the layer while the film has a magnetization in the plane thereof. The planar layer and film comprise an optical waveguide for propagation of linearly polarized light therethrough along a first axis. Linearly polarized light is coupled into the guide. A bubble expander stretches bubble domains in a direction transverse to their direction of movement as they are moved in the layer of magnetic material past the light guide on a second axis transverse the first axis. A sensor including a light coupling device for coupling light out of said waveguide senses changes in the polarization mode of the light propagating along the axis of the waveguide whereby the fringing field of the stretched bubble will modulate the polarized light propagating along the first axis and provide a light output signal from the sensor thereby indicating the passage of a magnetic domain.

REFERENCES:
patent: 3713120 (1973-01-01), Bobeck et al.
patent: 3859643 (1975-01-01), Borrelli

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