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Magnetic Domain Code Repeater

IP.com Disclosure Number: IPCOM000079459D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Sakalay, FE: AUTHOR

Abstract

Magnetic domain devices conventionally employ permeable T- and I-bar overlay patterns 1, 2 on a ferromagnetic cylindrical domain-supporting film, for defining domain propagation pathways. A bias magnetic field Hz is applied perpendicular to the film and a reorienting magnetic field, represented by the mutually perpendicular arrows H1, H2, H3, H4, is provided having a switchable direction within the plane of the film for, respectively, maintaining and propagating the cylindrical magnetic domains. The direction of this in-plane magnetic field switches in counterclockwise sequence.

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Magnetic Domain Code Repeater

Magnetic domain devices conventionally employ permeable T- and I-bar overlay patterns 1, 2 on a ferromagnetic cylindrical domain-supporting film, for defining domain propagation pathways. A bias magnetic field Hz is applied perpendicular to the film and a reorienting magnetic field, represented by the mutually perpendicular arrows H1, H2, H3, H4, is provided having a switchable direction within the plane of the film for, respectively, maintaining and propagating the cylindrical magnetic domains. The direction of this in-plane magnetic field switches in counterclockwise sequence.

A binary coded sequence of magnetic bubbles is supplied by a source 3 along pathway 4 to an output domain sensor 5. The presence of a bubble represents a binary 1 and the absence of a bubble a binary 0. Source 3 supplies one binary value for each complete rotation of the in-plane switching magnetic field. Area 6 in conjunction with area 7 is a magnetic domain interaction region, wherein a bubble along pathway 4 will interact with another bubble which may he present in area 7. Source 8 generates a continuous stream of bubbles which propagate along pathway 9 to area 7, wherefrom they normally continue to pass along to annihilator 10, unless a bubble (binary 1) is present at area 6. If so, the bubble at area 7 is diverted to continue along pathway 11 which finally merges into pathway 4, where the bubble continues to propagate to output sensor 5 via area 6.

In ef...