A low noise DC-SQUID based on NB/Al-AlOx/Nb Josephson junctions

Leif Grönberg, Heikki Seppä, Robin Cantor, Mikko Kiviranta, Tapani Ryhänen, Jorma Salmi, Ilkka Suni

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    Low noise dc SQUIDs based on a Nb/Al-AlOx/Nb Josephson junction technology have been developed. The design has been optimized for improved control of the resonances. An eight-level process has been used for device fabrication. Flux noise levels of 2.8×10−7Φ0/√Hz  at 1 kHz and 1.5×10−6Φ0/√Hz at 1 Hz have been measured for an integrated SQUID magnetometer having 3 μm2 junctions, a 12-turn input coil, and a dc SQUID inductance Ldc =11 pH.
    Original languageEnglish
    Title of host publicationSuperconducting Devices and Their Applications
    Subtitle of host publicationProceedings of the 4th International Conference SQUID ’91
    EditorsHans Koch, Heinz Lübbig
    Place of PublicationBerlin
    ISBN (Electronic)978-3-642-77457-7
    ISBN (Print)978-3-642-77459-1
    Publication statusPublished - 1991
    MoE publication typeA4 Article in a conference publication
    Event4th International Conference SQUID'91 - Berlin, Germany
    Duration: 18 Jun 199121 Jun 1991

    Publication series

    SeriesSpringer Proceedings in Physics


    Conference4th International Conference SQUID'91


    • Josephson junction
    • SQUID

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    Grönberg, L., Seppä, H., Cantor, R., Kiviranta, M., Ryhänen, T., Salmi, J., & Suni, I. (1991). A low noise DC-SQUID based on NB/Al-AlOx/Nb Josephson junctions. In H. Koch, & H. Lübbig (Eds.), Superconducting Devices and Their Applications: Proceedings of the 4th International Conference SQUID ’91 (pp. 281-285). Springer. Springer Proceedings in Physics, Vol.. 64 https://doi.org/10.1007/978-3-642-77457-7_50