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Suppression of Magnetic Flux Noise in YBa2Cu3O7−x Flux Transformers

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Superconducting Devices and Their Applications

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 64))

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Abstract

We have constructed hybrid magnetometers by coupling a flux transformer of YBa2Cu3O7−x to a Nb-Pbln SQUID. The low frequency (1/f) noise is dominated by fluctuations in the supercurrent circulating in the transformer, driven by vortex motion. The application of a small static magnetic field induces a supercurrent that reversibly suppresses the noise, in quantitative agreement with a model of thermally activated vortex hopping between symmetrical pairs of pinning sites. A persistent current can be used to reduce the low frequency noise power of high-Tc flux transformers by at least one order of magnitude.

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Author information

Authors and Affiliations

  1. Department of Physics, University of California, Berkeley, CA, 94720, USA

    M. J. Ferrari, J. J. Kingston & J. Clarke

  2. Center for Advanced Materials, Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA, 94720, USA

    M. J. Ferrari, J. J. Kingston & J. Clarke

  3. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD, 20742-4111, USA

    F. C. Wellstood

  4. Bell Communications Research, 331 Newman Springs Road, Red Bank, NJ, 07701-7030, USA

    M. Johnson

Authors
  1. M. J. Ferrari
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  2. F. C. Wellstood
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  3. J. J. Kingston
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  4. M. Johnson
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  5. J. Clarke
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Editor information

Editors and Affiliations

  1. Institut Berlin, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, W-1000, Berlin 10, Fed. Rep. of Germany

    Hans Koch  & Heinz Lübbig  & 

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© 1992 Springer-Verlag Berlin Heidelberg

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Ferrari, M.J., Wellstood, F.C., Kingston, J.J., Johnson, M., Clarke, J. (1992). Suppression of Magnetic Flux Noise in YBa2Cu3O7−x Flux Transformers. In: Koch, H., Lübbig, H. (eds) Superconducting Devices and Their Applications. Springer Proceedings in Physics, vol 64. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77457-7_7

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  • DOI: https://doi.org/10.1007/978-3-642-77457-7_7

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-77459-1

  • Online ISBN: 978-3-642-77457-7

  • eBook Packages: Springer Book Archive

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