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Imaging of the dynamic magnetic structure in a parallel array of shunted Josephson junctions

T. Doderer, V. K. Kaplunenko, J. Mygind, and N. F. Pedersen
Phys. Rev. B 50, 7211(R) – Published 1 September 1994
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Abstract

A one-dimensional (1D) parallel array of shunted Josephson junctions is one of the basic elements in the family of rapid single-flux quantum logic circuits. It was found recently that current steps always show up in the current-voltage curve of the generator junction when an additional bias current is applied to the edge junction of the array. This effect was found to be due to the self-induced magnetic field produced by the edge current. This nonuniform field divides the array into domains each spanning several unit cells and each containing the same number of flux quanta. We report on experimental results obtained by low-temperature scanning electron microscopy (LTSEM) on the 1D array. The (1–3)-μm spatial resolution achieved by LTSEM enables us to image these domains in scanned measurements where the junctions in the array are heated sequentially. Computer simulations confirm the mechanism of the obtained images and the number of observed domains corresponds to the step position as predicted numerically.

    DOI:https://doi.org/10.1103/PhysRevB.50.7211

    ©1994 American Physical Society

    Authors & Affiliations

    T. Doderer

    • Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universität Tübingen, D-72076 Tübingen, Germany

    V. K. Kaplunenko

    • Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 103907 Moscow, Russia

    J. Mygind and N. F. Pedersen

    • Physics Department, Technical University of Denmark, DK-2800 Lyngby, Denmark

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    Vol. 50, Iss. 10 — 1 September 1994

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