A Compact Very Low Noise DC-SQUID Magnetometer

  • R. Cantor
  • T. Ryhänen
  • H. Seppä
Part of the Springer Proceedings in Physics book series (SPPHY, volume 64)


We have designed and fabricated a very low noise integrated dc Superconducting QUantum Interference Device (SQUID) magnetometer on a 4×4 mm2 chip. The white flux noise at 1 kHz is \(6 \times {10^{ - 7}}{\Phi _0}/\sqrt {Hz} \). This corresponds to a flux density noise of \(3.4\;fT/\sqrt {Hz} \) and a coupled energy resolution of 32 h. The 1/f noise corner frequency is 10 Hz and the 1/f flux noise at 1 Hz is \(2 \times {10^{ - 6}}{\Phi _0}/\sqrt {Hz} \).


Superconducting QUantum Interference Device Input Coil Flux Noise Applied Flux Junction Shunt Resistance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    M.B. Ketchen and R.F. Voss, Appl. Phys. Lett. 35, 812 (1979).ADSCrossRefGoogle Scholar
  2. [2]
    M.W. Cromar and P. Carelli, Appl. Phys. Lett. 38, 723 (1981).ADSCrossRefGoogle Scholar
  3. [3]
    J.M. Jaycox and M.B. Ketchen, IEEE Trans. Magn. MAG-17, 400 (1981).Google Scholar
  4. [4]
    M.B. Ketchen and J.M. Jaycox, Appl. Phys. Lett. 40, 736 (1982).ADSCrossRefGoogle Scholar
  5. [5]
    R. Cantor, T. Ryhanen, D. Drung, H. Koch, and H. Seppa, IEEE Trans. Magn. MAG-27, 2927 (1991).Google Scholar
  6. [6]
    H. Seppa and T. Ryhanen, IEEE Trans. Magn. MAG-23, 1083 (1987).Google Scholar
  7. [7]
    D. Drung and W. Jutzi, in: SQUID’85, Superconducting Quantum Interference Devices and Their Applications, eds. H.D. Hahlbohm and H. Lubbig (Walter de Gruyter, Berlin, 1985 ), p. 807.Google Scholar
  8. [8]
    J. Knuutila, M. Kajola, H. Seppa, R. Mutikainen, and J. Salmi, J. Low Temp. Phys. 81, 369 (1988).ADSCrossRefGoogle Scholar
  9. [9]
    J.A. Ketoja, J. Kurkijarvi, and R.K. Ritala, Phys. Rev. B30, 3757 (1984).ADSCrossRefGoogle Scholar
  10. [10]
    T. Ryhanen, R. Cantor, D. Drung, H. Koch, and H. Seppa, IEEE Trans. Magn. MAG-27, (1991).Google Scholar
  11. [11]
    C. Hilbert and J. Clarke, J. Low Temp. Phys. 61, 237 (1985).ADSCrossRefGoogle Scholar
  12. [12]
    B. Muhlfelder, J.A. Beall, M.W. Cromar, R.H. Ono, and W.W. Johnson, IEEE Trans. Magn. MAG-21, 427 (1985).Google Scholar
  13. [13]
    T. Ryhanen, H. Seppa, R. Ilmoniemi, and J. Knuutila, J. Low Temp. Phys. 76, 287 (1989).ADSCrossRefGoogle Scholar
  14. [14]
    R. Cantor, D. Drung, M. Peters, and H. Koch, J. Appl. Phys. 67, 3038 (1990).ADSCrossRefGoogle Scholar
  15. [15]
    T. Ryhanen, R. Cantor, D. Drung, and H. Koch, Appl. Phys. Lett. 59, 228 (1991).ADSCrossRefGoogle Scholar
  16. [16]
    D. Drung, R. Cantor, M. Peters, H.J. Scheer, and H. Koch, Appl. Phys. Lett. 57, 406 (1990).ADSCrossRefGoogle Scholar
  17. [17]
    H. Seppa, to appear in Rev. Sci. Instrum.Google Scholar
  18. [18]
    T. Ryhanen, H. Seppa, R. Cantor, D. Drung, and H. Koch, these proceedings.Google Scholar
  19. [19]
    The calculation of the intrinsic flux noise in ref. 5 did not take the small dynamic resistance of the SQUID into account, which leads to an under-determination of the noise. The corrected white flux noise at 1 kHz for the magnetometer in ref. 5 is 6.7 x 10-7φ0/.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • R. Cantor
    • 1
  • T. Ryhänen
    • 2
  • H. Seppä
    • 2
  1. 1.Institut BerlinPhysikalisch-Technische BundesanstaltBerlin 10Fed. Rep. of Germany
  2. 2.Metrology Research InstituteHelsinki University of Technology and Technical Research Centre of FinlandEspooFinland

Personalised recommendations