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Phys Rev Lett. 2013 Apr 5;110(14):147002. Epub 2013 Apr 5.

Magnetic flux noise in dc SQUIDs: temperature and geometry dependence.

Author information

1
Department of Physics, University of California, Berkeley, California 94720-7300, USA.
2
MIT Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA.
3
National Institute of Standards and Technology, Boulder, Colorado 80309-044, USA.
4
Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
5
Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany.

Abstract

The spectral density S(Φ)(f) = A(2)/(f/1 Hz)(α) of magnetic flux noise in ten dc superconducting quantum interference devices (SQUIDs) with systematically varied geometries shows that α increases as the temperature is lowered; in so doing, each spectrum pivots about a nearly constant frequency. The mean-square flux noise, inferred by integrating the power spectra, grows rapidly with temperature and at a given temperature is approximately independent of the outer dimension of a given SQUID. These results are incompatible with a model based on the random reversal of independent, surface spins.

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