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Published July 1979 | Published
Journal Article Open

High-frequency propagation and failure of asymmetric half-disk field access magnetic bubble device elements


High-frequency propagation characteristics and failure modes in 14-μm period, 1.8-μm gap, asymmetric half-disk field-access device were studied using a high-speed optical sampling technique. Propagation elements as well as normal and hand gun corners and chevron structures were included. The operating bias margin at 1MHz, for a structure that had 1.2 MHz as highest possible frequency, was about half of the margin for frequencies of 200 kHz and below. The phase lag between the bubble leading wall and the instantaneous rotating field direction was nearly 90° as the bubble moved through the center of the element where the lag was the greatest. The peak velocity of the leading wall of 55 m/s and the trailing wall of 46 m/s is attributed to bubble interaction with the Permalloy structure creating a ∼125 Oe in-plane field that greatly increases the free bubble "saturation" velocity.

Additional Information

© 1979 IEEE. Manuscript received December 1, 1978; revised February 26, 1979. This work was supported by the National Science Foundation Division of International Programs under Grant INT 76-02666 and by the Division of Materials Research under Grant DMR-77-2402.

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August 19, 2023
October 26, 2023