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Field Access Contiguous Disk Bubble Transfer

IP.com Disclosure Number: IPCOM000051700D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 71K

Publishing Venue

IBM

Related People

Keefe, GE: AUTHOR [+3]

Abstract

In magnetic bubble domain chips using magnetic charged walls for movem of the bubble domains, transfer switches have been provided using a magnetic charged wall that substantially bridged the space between two propagation paths. Bubble domains propagating in either of the two paths would strip-out along the bridging charged wall, and transfer directionality was achieved by superposition of a magnetic field from an overlying conductor. In order to eliminate the need for multiple masks, and the need to have the propagation paths sufficiently far apart that independent propagation can be achieved, it is proposed to use phasing of the in-plane magnetic drive field to effect transfer, thereby eliminating the need for the transfer conductor.

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Field Access Contiguous Disk Bubble Transfer

In magnetic bubble domain chips using magnetic charged walls for movem of the bubble domains, transfer switches have been provided using a magnetic charged wall that substantially bridged the space between two propagation paths. Bubble domains propagating in either of the two paths would strip-out along the bridging charged wall, and transfer directionality was achieved by superposition of a magnetic field from an overlying conductor. In order to eliminate the need for multiple masks, and the need to have the propagation paths sufficiently far apart that independent propagation can be achieved, it is proposed to use phasing of the in-plane magnetic drive field to effect transfer, thereby eliminating the need for the transfer conductor.

In Fig. 1, a bubble normally propagates from point 1 through 3 to 5 during in-plane field H phases 1 through 5. This is because the cusp at point 3 is not deep enough (i.e., less than one bubble diameter) to interrupt normal propagation. Under normal propagation conditions, a bridging charged wall will not form between the major and minor loops with sufficient strength to stretch the bubble between the major and minor loops. Thus, close spacing between the major and minor loops at this point can be achieved. However, if the rotating in-plane field is turned off at phase 3, the bubble will reside in the small cusp at point 3, and if the in-plane field is then reversed to phase 7, an attractive charged wall will form on the tip of the major loop (point 7). The bubble will then stretch out and transfer to it. The operation in step sequence is as follows: 1....