Improving the sensitivity of a high-Tc SQUID magnetometer with a serial array

Chiu Hsien Wu, K. L. Chen, J. C. Chen, M. J. Chen, C. Y. Chen, C. T. Chiang, Hong Chang Yang, Herng Er Horng, J. T. Jeng

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    To pursue a high-reproducibility and high-quality SQUID for high-T c superconducting applications, we have designed and fabricated a flip-chip magnetometer as a sensor for measuring weak magnetic signals. The magnetometer consists of a serial SQUID magnetometer coupled to a flux focuser. The SQUIDs are connected in series, thereby increasing the peak-to-peak value of the voltage-flux transfer function, Vφ. A flux focuser is employed to increase the effective area of the SQUID. The serial SQUID array has high-quality device characteristics. High-Tc SQUID magnetometers exhibiting a magnetic field sensitivity of ∼45 fT/Hz1/2 in the white region and 200 fT/Hz1/2 at 1 Hz have been demonstrated in this work. The flip-chip SQUID magnetometer shows a sufficiently high sensitivity to record magnetocardiograms.

    Original languageEnglish
    Pages (from-to)1109-1113
    Number of pages5
    JournalJournal of the Korean Physical Society
    Issue number5 I
    Publication statusPublished - 2006 May 1


    • Flip-chip
    • Flux focuser
    • Serial SQUID

    ASJC Scopus subject areas

    • Physics and Astronomy(all)


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