Reduction of 1/{ital f} noise in high-{ital T}{sub {ital c}} dc superconducting quantum interference devices cooled in an ambient magnetic field

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.117831· OSTI ID:404008

Dantsker, E; Tanaka, S; Nilsson, P; Kleiner, R; Clarke, J ^[1]

---

1. 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 Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 404008
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 69; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
FLUX QUANTIZATION
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
NOISE
SQUID DEVICES
THIN FILMS
YTTRIUM OXIDES