Gapless magnetic bubble propagation path structure

Details Gapless magnetic bubble propagation path structure Gapless magnetic bubble propagation path structure

1975-02-03

1977-05-31

Moffitt, James W.

Communications: electrical

Digital comparator systems

G11C 1114

Patent

active

040272974

ABSTRACT:
A gapless propagation path structure for magnetic bubbles in a magnetic bubble domain memory system employing permalloy elements, wherein the drive field requirements for the in-plane rotating magnetic field may be reduced for high magnetization materials. An overlay pattern of magnetizable material, e.g. permalloy, is provided on a layer of magnetic material of a type suitable for the propagation of magnetic bubble domains therein. The magnetizable overlay pattern includes respective magnetizable elements forming the propagation paths for the magnetic bubble domains, the elements being so arranged as to provide a continuous track of magnetizable material included in the magnetizable overlay pattern, thereby defining a gapless propagation path for the magnetic bubble domains. The in-plane rotating magnetic field within the plane of the magnetic layer on which the magnetizable overlay pattern is disposed causes magnetic bubble domains to travel along respective gapless propagation paths included in the magnetic bubble domain memory system, there being respective movement-controlling elements associated with the gapless propagation paths for maintaining the magnetic bubble domains in motion along the selected bubble propagation path therefor.

REFERENCES:
patent: 3534347 (1970-10-01), Bobeck
patent: 3828329 (1974-08-01), Fischer et al.
patent: 3866190 (1975-02-01), DEJonge et al.
patent: 3914751 (1975-10-01), Keefe
IEEE Transactions on Magnetics, "X-Bar, a New Propagation Pattern for Magnetic Bubbles," by Parzefall, et al., vol. Mag-9, No. 3, 9/73; pp. 293-297 .

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