Double relaxation oscillation superconducting quantum interference devices with gradiometric layout

M.J. van Duuren, G.C.S. Brons, D.J. Adelerhof, J. Flokstra, H. Rogalla

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    Abstract

    Double relaxation oscillation superconducting quantum interference devices (DROSs) with a gradiometric signal SQUID and either a reference SQUID or a reference junction will be presented in this article. The devices are user friendly, particularly those with a reference junction. Because of the large flux-to-voltage transfer of ∂V/∂Φ=0.7–1mV/Φ0, the devices can be operated in a flux locked loop based on direct voltage readout without loss of sensitivity. The typical white flux noise of the DROSs amounts to √S𝛷=5–6μΦ0/√Hz, which corresponds to an energy resolution ε=S𝛷/2Lsq≃200h. Coupled to an external planar first-order gradiometer, a white magnetic field sensitivity of √S𝐵<2fT/√Hz was measured inside a magnetically shielded room.
    Original languageEnglish
    Pages (from-to)3598-3606
    Number of pages9
    JournalJournal of Applied Physics
    Volume82
    Issue number7
    DOIs
    Publication statusPublished - 1997

    Keywords

    • n/a OA procedure

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