| 摘要 |
A ferromagnetic overlay pattern for a field-accessed bubble chip includes successive linear segments of alternately high and low magnetic coercivity. The hard magnetic elements are given a predetermined polarity by an initial giant drive pulse. The soft magnetic elements are driven by intermittent pulses of insufficient amplitude to switch the hard elements. The circuit materials are chosen so that the temporary poles formed in the soft magnetic elements are stronger than those of the hard magnetic elements. When the periodic field is applied, bubbles move to the attracting poles of the soft elements. When the periodic field is off, the bubbles move to the attracting poles of the hard elements. Propagation in opposite directions under the control of the same periodic field is described for parallel zigzag circuits of alternate hard-soft elements. Mutually exclusive orthogonal zigzag circuits enable selective propagation with different drive field alignments.
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