Browse Prior Art Database

Wide Conductor Switches for Bubble Devices

IP.com Disclosure Number: IPCOM000087198D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Kryder, MH: AUTHOR

Abstract

Wide conductor switches are proposed for use in a bubble device in which no critical alignment of masks is required. These switches provide the advantages of reduced current densities for bubble replicate transfer in single level masking devices and simplified processing of devices using coincident selection or other interconnection techniques.

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Wide Conductor Switches for Bubble Devices

Wide conductor switches are proposed for use in a bubble device in which no critical alignment of masks is required. These switches provide the advantages of reduced current densities for bubble replicate transfer in single level masking devices and simplified processing of devices using coincident selection or other interconnection techniques.

Figs. 1 and 2 illustrate two classes of these switches. In Fig. 1, a bubble propagating along the direction of arrow 10 in chevron propagation path A will stretch to a total length of seven chevrons when it reaches x=7 on propagation path A. If no current is applied to the wide conductor, the bubble will shrink back to a length of three chevrons at x=9, propagating further on path A. On the other hand, if a current pulse is applied, in the direction shown, to the wide conductor when the 7 chevron wide bubble reaches point x=8 on the propagation path, it will stretch further into propagation path B and be cut into two bubbles, one in path A and one in path B, which travels along the direction of arrow 12. There are at least two potential methods for the bubble cutting: (1) The current pulse in the wide conductor will cut the bubble under the upper half of the conductor because the z-directed field is in the direction to collapse a bubble there. (2) The stretching of the bubble between the two propagation paths after subsequent rotation of the field will in itself cut the bubble. Of course, a combination of these two methods is also possible.

In Fig. 2, current...