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Shift Register for Cylindrical Magnetic Domains

IP.com Disclosure Number: IPCOM000074296D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Keefe, GE: AUTHOR [+2]

Abstract

Existing cylindrical domain shift registers are generally one dimensional, using multiphase drives. The structure shown in Figs. A and B provides a single-phase drive shift register.

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Shift Register for Cylindrical Magnetic Domains

Existing cylindrical domain shift registers are generally one dimensional, using multiphase drives. The structure shown in Figs. A and B provides a single- phase drive shift register.

A magnetic sheet 10 in which cylindrical domains can propagate has deposited thereon a strip line 12 (such as copper). Deposited on the strip line is a zig-zag array of permalloy wedges 14. If the wedges 14 were not present, cylindrical domains 16 would move across strip line 12. The presence of wedges 14 makes the domains propagate along the strip line following the wedge pattern 1-2-1'-2', in response to currents 1 in strip line 12 in accordance with Fig. B.

Wedges 14 not only control the directionality of motion, but also provide a pseudodrive for the domains. Since domains propagate along the direction of strip line 12 rather than across the line, high-packing density will result. For instance, domains can be packed at a density of two wedges per bit since the junctions between the adjacent wedges provide low-energy sites for domains 16.

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