Magnetic flux noise in dc SQUIDs: temperature and geometry dependence
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...
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| Veröffentlicht in: | Physical review letters 2013-04, Vol.110 (14), p.147002-147002, Article 147002 |
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| container_title | Physical review letters |
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| creator | Anton, S M Birenbaum, J S O'Kelley, S R Bolkhovsky, V Braje, D A Fitch, G Neeley, M Hilton, G C Cho, H-M Irwin, K D Wellstood, F C Oliver, W D Shnirman, A Clarke, John |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevLett.110.147002 |
| format | Article |
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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. 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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. 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| title | Magnetic flux noise in dc SQUIDs: temperature and geometry dependence |
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