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C Bar Bubble Domain Shift Registers

IP.com Disclosure Number: IPCOM000087224D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Cohen, MS: AUTHOR [+3]

Abstract

Bubble domains can be propagated in a magnetic medium using propagation elements having a design similar to the letter C. These "C-bars" provide reliable bubble propagation with good margins. In particular, they are made with less stringent lithography and require lower magnetic drive fields for movement of the bubble domains. In propagation from one C-bar to the adjacent C-bar, a strip-out mechanism occurs whereby the bubble actually bridges magnetic poles located on adjacent C-bars.

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C Bar Bubble Domain Shift Registers

Bubble domains can be propagated in a magnetic medium using propagation elements having a design similar to the letter C. These "C-bars" provide reliable bubble propagation with good margins. In particular, they are made with less stringent lithography and require lower magnetic drive fields for movement of the bubble domains. In propagation from one C-bar to the adjacent C-bar, a strip-out mechanism occurs whereby the bubble actually bridges magnetic poles located on adjacent C-bars.

It has been discovered that cornering in a closed loop shift register comprised of C-bars is difficult. Referring to the drawing, at high bias, pole 3 on corner C- bar 10 is considerably weaker than pole 3 on propagation C-bar 12 when the magnetic field H is in direction 3. This means that a bubble domain will not easily strip-out and transfer from element 12 to corner element 10. At low bias, when magnetic field H is in direction 1, strip-out of a domain from pole 1 on element 12 to the very strong pole 1 on element 10 occurs.

I-bar 14 is located between C-bar 12 and corner C-bar 10 in order to overcome these problems. The attractive pole formed on the end of element 14 when field H is in direction 3 aids strip-out and transfer of bubble domains from C-bar 12 to corner C-bar 10. Furthermore, the presence of I-bar 14 between C- bar 12 and corner C-bar 10 prevents the bubble on C-bar 12 from stripping to corner C-bar 10. As an alternative, corner e...