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High Density Conductor Pattern

IP.com Disclosure Number: IPCOM000073872D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR

Abstract

This conductor pattern can be used in a bi-phase magnetic bubble domain shift register to achieve high packing density and speed. The concept employed is to widen the envelope of the normal magnetic field contour produced by a conductor loop so that two loops will constitute one bit, in contrast to the existing patterns where each bit requires four conductor loops.

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High Density Conductor Pattern

This conductor pattern can be used in a bi-phase magnetic bubble domain shift register to achieve high packing density and speed. The concept employed is to widen the envelope of the normal magnetic field contour produced by a conductor loop so that two loops will constitute one bit, in contrast to the existing patterns where each bit requires four conductor loops.

Figs. 1A-1C show the existing conductor pattern and the magnetic field produced by that pattern, while Figs. 2A-2C show the proposed conductor pattern.

In conductor circuits for control of bubble domain motion, the geometry and dimensions of the conductor pattern are selected so that a highly localized field can be produced to overcome the domain wail coercivity and cause domain propagation. A bubble domain is moved toward an adjacent conductor loop when the domain is initially in contact with some portion of the positive gradient field (assuming the bubble is positively magnetized) produced by that loop. This places a lower limit on the bubble domain size and an upper limit on the spacing between adjacent conductor loops.

In Figs. 1A and 1B, a side view and top view of an existing conductor pattern are shown. The conductor plane is close to the orthoferrite platelet 10 in which the bubble domains propagate. This arrangement creates a strong normal field component Hz with a narrow envelope (Fig. 1C). The consequence of having this type of field is the reduction of packing...