Method and apparatus for the controlled generation of wall-encod

Details Method and apparatus for the controlled generation of wall-encod Method and apparatus for the controlled generation of wall-encod

1974-10-25

1976-12-07

Moffitt, James W.

Communications: electrical

Digital comparator systems

340174EB, 340174VA, G11C 1114

Patent

active

039965775

ABSTRACT:
A magnetic layer is exchange coupled to a bubble medium in an area where bubble domains are nucleated, and is used together with or without an externally applied in-plane magnetic field to controllably generate bubble domains with either one pair (S = 0) or no Bloch lines (S = 1), respectively. The exchange coupled magnetic layer can be either an ion-implanted layer, a thin garnet film with planar magnetization, or a thin permalloy film. The exchange coupled magnetic layer may be positioned either on top of or below the bubble film used for storage. An information store utilizing domain interaction for bubble domain storage such as lattice array is accomplished by having each bubble domain representing either binary bit according to its domain wall state. The controlled switching of bubble domain wall states from any state to either one of two known states can be achieved by subjecting the wall of the bubble domain to a critical velocity, depending upon the application or not of the external in-plane magnetic field to the exchange coupled magnetic layer.

REFERENCES:
patent: 3662359 (1972-05-01), Genovese
patent: 3899779 (1975-08-01), Malozemoff
patent: 3930243 (1975-12-01), Hsu et al.
IBM Technical Disclosure Bulletin-vol. 17, No. 5, Oct. 1974, p. 1485.
Appl. Phys. Lett. "Suppression of Hard Bubbles by a Thin Permalloy Layer" by Lin et al.; vol. 22, No. 11, 6/73, pp. 603, 604.
Bell System Tech. Journal "A New Type of Cyl. Magnetic Domain" by Tabor et al.; vol. 51, No. 6, July-Aug. 1972, pp. 1427-1430.
Amer. Inst. of Phys.; AIP Conf. Proc.; "Bubble Lattices" by Je Jonge et al.; No. 5, Part 1; 11/16-19/1971.

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