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Bubble Propagation Technique for Improved Stability

IP.com Disclosure Number: IPCOM000086143D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Beaulieu, TJ: AUTHOR

Abstract

Synchronous bias field modulation pulses whose polarity is such to add to the nominal bias field enhance the wall state stability of bubbles. The proper bias modulation depends on (1) pulse amplitude sufficient to correct for the bias field variations along the bubble trajectory, (2) pulse shape, (3) pulse delay with respect to the propagation pulses, and (4) pulse duration such that the modulation pulse and the propagation pulse terminate at the same time.

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Bubble Propagation Technique for Improved Stability

Synchronous bias field modulation pulses whose polarity is such to add to the nominal bias field enhance the wall state stability of bubbles. The proper bias modulation depends on (1) pulse amplitude sufficient to correct for the bias field variations along the bubble trajectory, (2) pulse shape, (3) pulse delay with respect to the propagation pulses, and (4) pulse duration such that the modulation pulse and the propagation pulse terminate at the same time.

An example of the increased wall state stability is shown in the following example.

For gum conductors on 15um centers, the maximum wall state lifetime without modulation for drive currents between 18 and 24 mA was less than 10/4/ steps to state conversion. With the optimum bias modulation pulse shown in the figure, lifetimes in excess of 10/7/ steps to conversion were obtained were obtained for both S=0 and S=+1 wall states.

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