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

*Corresponding author for this work

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


  • Flip-chip
  • Flux focuser
  • Serial SQUID

ASJC Scopus subject areas

  • General Physics and Astronomy


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