G - Physics – 11 – C
Patent
G - Physics
11
C
352/37.3
G11C 11/14 (2006.01) G11C 19/08 (2006.01)
Patent
CA 1051547
METHOD AND APPARATUS FOR THE CONTROLLED GENERATION OF WALL-ENCODED MAGNETIC BUBBLE DOMAINS Abstract of the Disclosure A magnetic layer is exchange coupled to a bubble medium in an area where bubble domains are nucleated, and is used together with or with- out 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 magnetica- tion, 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 sub- jecting the wall of the bubble domain to a critical velocity, depend- ing upon the application or not of the external in-plane magnetic field to the exchange coupled magnetic layer.
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