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# Bubble Domain Logic Devices

IP.com Disclosure Number: IPCOM000074148D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 62K

IBM

Lin, YS: AUTHOR

## Abstract

A complete logical connective including bistable devices can be designed using conductor patterns on a bubble domain sustaining material. In the figures, a combinatorial AND/OR circuit, an inverter circuit, and a flip-flop are fabricated using conductor patterns.

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Bubble Domain Logic Devices

A complete logical connective including bistable devices can be designed using conductor patterns on a bubble domain sustaining material. In the figures, a combinatorial AND/OR circuit, an inverter circuit, and a flip-flop are fabricated using conductor patterns.

In Fig. 1A, an AND/OR circuit is comprised of semiorthogonal conductor patterns located on two conductor circuits semiorthogonal to each magnetic sheet 10. These conductor patterns utilize two-phase drive (I(1),I(2)) and permalloy dots to control the directionality of motion of the bubble domains. The permalloy dots are shifted asymmetrically with respect to the conductor loops so that the bubble domain is consistently shifted prior to each propagation phase. At the junction region of the patterns, the spacings between conductor loops are varied so that output path C is always preferred for bubble domains from both input channels A and B. Thus, C = A + B is the OR function. When both channels A and B have bubble domain inputs, the bubble domain from channel B is repelled from position 1 to position 1'' and travels downward to output D providing the AND function (D = A . B).

In Fig. 1B, an inverter circuit is comprised of conductor patterns offset from one another on the same side of a bubble domain sustaining material 10. Two- phase drive currents I(1), I(2) are used and permalloy dots control the directionality of motion of bubble domains. Arrangement of conductor patterns at the junction region insures that output track C is always preferred for bubble domains from dummy input channel B unless a bubble domain enters from input
A. When a bubble domai...