Browse Prior Art Database

All Permalloy, Conductorless Bubble Chip

IP.com Disclosure Number: IPCOM000051455D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 89K

Publishing Venue

IBM

Related People

Tao, LJ: AUTHOR

Abstract

A conductorless chip employing C-bar type elements switches bubbles by reversing the drive field momentarily. The operation of switches by drive field reversing is based on the non-reciprocal design of the permalloy pattern. Instead of propagating backward when the drive field is reversed, the bubbles follow a new path of permalloy patterns.

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All Permalloy, Conductorless Bubble Chip

A conductorless chip employing C-bar type elements switches bubbles by reversing the drive field momentarily. The operation of switches by drive field reversing is based on the non-reciprocal design of the permalloy pattern. Instead of propagating backward when the drive field is reversed, the bubbles follow a new path of permalloy patterns.

As shown in the drawing, the conductorless chip 10 has a generator 12 that replicates a bubble onto skyhook element 14 on a counterclockwise (CCW) rotation of the drive field. With a clockwise (CW) rotation, no bubble is generated. Hence, a "1" is written into the major loop input channel 16 by one CCW rotation followed by two CW rotations, while a "0" is written by a single CW rotation.

The bubbles propagate along the input channel 16 with CW rotation until they reach the switch elements 18A-18E. The bubbles will pass from switch elements 18A-18E along elements 20A-20E into minor loops 22A-22E, respectively, with one complete CCW rotation, whereas they will continue down channel 16 with CW rotation. Bubbles will circulate around minor loops 22A-22E with CW rotation.

With two complete CCW rotations, a bubble on a minor loop transfer-out switches 24A-24E will propagate to the major output channel 26. Two CCW rotations are required due to the presence of additional C-bar elements 25A-25E. C-bar elements 25A-25E differentiates the transfer-in and transfer-out operation which requires only...