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Browse Prior Art Database

Shifting Register

IP.com Disclosure Number: IPCOM000098073D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Ghisler, W: AUTHOR [+2]

Abstract

In the shifting register, transfer of binary information is effected by propagation of domain walls which separate differently aligned zones of magnetization. The register comprises a plurality of annular magnetic film cells. These cells exhibit a circular-uniaxial magnetic anisotropy. The magnetization in these cells has a preferred direction which is in the tangential direction.

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Shifting Register

In the shifting register, transfer of binary information is effected by propagation of domain walls which separate differently aligned zones of magnetization. The register comprises a plurality of annular magnetic film cells. These cells exhibit a circular-uniaxial magnetic anisotropy. The magnetization in these cells has a preferred direction which is in the tangential direction.

On substrate 1, which can be made of glass, there are a number of ring- shaped magnetic film cells 11...19. These are placed concentrically with respect to holes, provided in the substrate 1 for driving conductors. Adjacent cells are physically connected by a predetermined marginal section of their circumference. In the initial or 0 position, shown in the drawing, the magnetization of neighboring cells is aligned in opposite circular directions. In this way, no domain walls appear at the location of physical connection of two adjoining cells. The continuity of the direction of magnetization is preserved. The 1 position is characterized by a reversed state of magnetization. Thus, between two neighboring cells in which is stored a 1 and a 0, respectively, a domain wall appears.

In a three-step shifting register, the magnetic film cells are subdivided into three groups A, B and C, associated with three respective driving conductors. Positive current pulses are fed into A at clock times 1, 7, 13, 19, 25, 31, and negative current pulses at clock times 4, 10, 16, 22, 28. Pos...