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Angelfish Logical Connectives for Bubble Domains

IP.com Disclosure Number: IPCOM000074100D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 82K

Publishing Venue

IBM

Related People

Almasi, GS: AUTHOR [+3]

Abstract

Complete logical connectives and a bistable device for magnetic bubble domains are achieved by using angelfish circuitry located on a bubble domain sustaining material, such as orthoferrite 10. The principles described here can be used to provide other logic devices using angel-fish circuitry.

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Angelfish Logical Connectives for Bubble Domains

Complete logical connectives and a bistable device for magnetic bubble domains are achieved by using angelfish circuitry located on a bubble domain sustaining material, such as orthoferrite 10. The principles described here can be used to provide other logic devices using angel-fish circuitry.

In Fig. 1, a flip-flop circuit is shown. A bubble domain located at position 1 during the contraction phase of the bias field will see two possible paths - 2 and 2' - during the subsequent expansion phase. Path 2 is always preferred because of its proximity to permalloy wedge 1, unless another domain is present at position 3. When the bubble domain reaches position 3, it will be trapped between positions 3 and 4 during the contraction and expansion phases, respectively, until a new bubble domain in input track A forces it out of this idle position. If a new bubble domain reaches position 1, the two bubble domains will repel each other during the expansion phase of the propagating bias field. This repelling force moves the first bubble out of the idle position so that it will reach position 4', and also forces the new input bubble to path 2' instead of path 2. The device functions as a flip-flop with one input and two identical outputs B, C, the state of the flip-flop being determined by the presence or absence of a bubble in the idler position 3.

Fig. 2 shows an AND/OR logic device using two orthogonal angelfish circuits. Propagation of bubble domains is achieved by modulating the magnetic bias field. Control of directionality of the bubble domains is achieved by the size and orientation the permalloy wedges at the junction of the orthogonal angelfish circui...