Reduction of 1/{ital f} noise in high-{ital T}{sub {ital c}} dc superconducting quantum interference devices cooled in an ambient magnetic field
- Department of Physics, University of California, Berkeley, California 94720 (United States)
The spectral density {ital S}{sub {Phi}}({ital f}) of the low-frequency 1/{ital f} noise of high transition temperature dc superconducting quantum interference devices (SQUIDs) with narrow linewidths was independent of {ital B}{sub 0}, the magnetic field in which they were cooled, up to a threshold value, about 33 {mu}T in the best case. Above this threshold, which is associated with the entry of flux vortices into the film, the noise increased rapidly. By contrast, for large square washer SQUIDs, {ital S}{sub {Phi}}({ital f}) scaled linearly with {ital B}{sub 0}. Estimates indicate that the 1/{ital f} flux noise produced by the pickup loop of a directly coupled magnetometer is negligible. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 404008
- Journal Information:
- Applied Physics Letters, Vol. 69, Issue 26; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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