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Two Dimensional Shift Register for Cylindrical Magnetic Domains

IP.com Disclosure Number: IPCOM000074284D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Chang, H: AUTHOR

Abstract

This two-dimensional shift register uses a permalloy propagation pattern on both sides of the magnetic sheet 10 in which the domains exist. The top T and I bar pattern is shown in solid lines and provides propagation in the direction indicated by arrow 12, under the influence of rotating magnetic field H. The bottom permalloy pattern, indicated by T and 1 bar elements shown in dashed lines, provides propagation vertically in the direction of arrow 14.

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Two Dimensional Shift Register for Cylindrical Magnetic Domains

This two-dimensional shift register uses a permalloy propagation pattern on both sides of the magnetic sheet 10 in which the domains exist. The top T and I bar pattern is shown in solid lines and provides propagation in the direction indicated by arrow 12, under the influence of rotating magnetic field H. The bottom permalloy pattern, indicated by T and 1 bar elements shown in dashed lines, provides propagation vertically in the direction of arrow 14.

When domains are propagating in the direction of arrow 12 under the influence of the top permalloy pattern, they are not affected by the permalloy elements used for propagation in the direction of arrow 14. Similarly, when domains are propagating in the direction of arrow 14, they are not affected by the elements responsible for propagation in the direction of arrow 12. Assume that the pole positions of the elements in the top overlay are denoted by numbers 1, 2, 3, and 4, while the pole positions of the bottom elements are denoted by 1', 2', 3', and 4'. At pole positions 4 during field direction 4, the adjacent horizontal bars of the bottom overlay have no influence on the domain. During field direction 1, pole position 3' will repel the domain while pole position 1 will attract the domain.

In order to propagate domains by the bottom pattern, all domains are first moved to pole positions 2. The normal magnetic field sequence H is then changed from 1, 2...