Identifying the source of 1/f noise in SQUIDs made from high-temperature superconductors
- 27 January 1992
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 60 (4) , 507-509
- https://doi.org/10.1063/1.106619
Abstract
We compare model predictions for 1/f noise in dc SQUIDs with experimental data and show that the 1/f noise in the our devices results from fluctuations in the magnitude of the critical current of the Josephson junctions that form the SQUID. Operating the SQUID while the bias current direction was being alternated canceled the 1/f noise power from these fluctuations and reduced the output noise power by two orders of magnitude. Using this process, we have measured the 1/f noise in several SQUIDs to be 1×10−7 Φ02/Hz at 0.1 Hz and 77 K, the lowest value reported to date.Keywords
This publication has 6 references indexed in Scilit:
- Low noise YBa2Cu3O7−δ grain boundary junction dc SQUIDsApplied Physics Letters, 1990
- Measured performance parameters of gradiometers with digital outputIEEE Transactions on Magnetics, 1989
- Low-frequency noise in low 1/f noise dc SQUID’sApplied Physics Letters, 1986
- Composition ofNoise in Metal-Insulator-Metal Tunnel JunctionsPhysical Review Letters, 1984
- Flicker (1/f) noise in tunnel junction dc SQUIDSJournal of Low Temperature Physics, 1983
- Low-frequency fluctuations in solids:noiseReviews of Modern Physics, 1981