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Gap tolerant bubble propagation circuit

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3 Author(s)
Gergis, I.S. ; Rockwell International, Anaheim, California ; George, P.K. ; Kobayashi, T.

A new bubble propagation pattern for field access devices has been developed which has a period to gap ratio of 8:1. In this pattern of semicircular elements (half-disk) the gaps are situated between essentially parallel poles in contrast to the TI pattern where gaps are located between orthogonal poles. The bubble, therefore, comes under the influence of two strong parallel poles causing it to stretch across the gap. The energy barrier that would normally be encountered thus virtually disppears. Devices of 32, 18, and 10 μm periods have been designed and fabricated. The results show a typical margin of at least 20% of the bias field under normal operating conditions. The operating drive field is relatively low for small bubbles. The minimum drive field for a 10 μm period pattern is only 13 Oe.

Published in:

Magnetics, IEEE Transactions on  (Volume:12 ,  Issue: 6 )

Date of Publication:

Nov 1976

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