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Bubble Domain Logic Circuits

IP.com Disclosure Number: IPCOM000074313D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR

Abstract

Logical connectives and bistable circuits for magnetic bubble domains can be provided using herringbone permalloy patterns located on the bubble sustaining material. Domain propagation is achieved by generating a traveling magnetic charge with the combination of an in-plane DC magnetic field and an in-plane AC magnetic field.

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Bubble Domain Logic Circuits

Logical connectives and bistable circuits for magnetic bubble domains can be provided using herringbone permalloy patterns located on the bubble sustaining material. Domain propagation is achieved by generating a traveling magnetic charge with the combination of an in-plane DC magnetic field and an in-plane AC magnetic field.

In Fig. la, logic is provided by a cross permalloy bar 10 and two permalloy wedges 12 and 14 which make output track C a favorable path for bubbles from both input channels A and B. Therefore, output track C provides the OR function. When an input appears on both channels A and B, the bubble domain from input B is repelled into output track D instead of output track C. For instance, two input bubbles in channels A and B located at positions 1 and 3, respectively, will interact during the subsequent phase. The bubble domain at position 3 will be forced to select position 4 instead of position 2. Therefore, output track D provides the AND function.

Fig. 2A shows a flip-flop circuit in which the presence or absence of a bubble domain in an idler position 3 determines the state of the flip-flop. A bubble domain entering the device at position 1 will see two possible paths (2 and 2') during the subsequent phase of driving. Path 2 is preferred because of its proximity to position 1 unless another bubble domain is present at position 3. When the bubble domain reaches position 3 it will be trapped there due to the presen...