Method of improving the operation of a single wall domain memory

Details Method of improving the operation of a single wall domain memory Method of improving the operation of a single wall domain memory

1977-04-11

1979-04-10

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Disposition of elements

365 10, 365 37, 365235, G11C 1908

Patent

active

041492650

ABSTRACT:
A method of and an apparatus for improving the selective positioning of single wall domains or bubble domains in a bubble domain memory system is disclosed. The method includes the use of slotted intersecting digit and word drive lines that form memory areas, each memory area being defined by the inside opposing edges of the slotted drive lines at each intersection. Each memory area has four quadrants, three of which are effectively optically blocked by an opaque shield--a bubble domain in the one unblocked quadrant provides the desired Faraday rotation of a plane polarized coherent light beam to generate a beamlet that is optically detected as a binary digital signal. The slotted drive lines are formed below the surface of the bubble domain supporting layer whereby the so-provided magneto static barriers prevent bubble domain sticking in a selected one quadrant of the four quadrants of the memory area and prevent bubble domain escape from the memory area itself.

REFERENCES:
patent: 3715736 (1973-02-01), O'Donnell et al.
patent: 3913079 (1975-10-01), Rosier
patent: 3953842 (1976-04-01), Hu et al.
patent: 4012724 (1977-03-01), Hanson et al.

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