Suppression of magnetic flux noise in YBa{sub 2}Cu{sub 3}O{sub 7-x} flux transformers
Conference
·
OSTI ID:10105319
We have constructed hybrid magnetometers by coupling a flux transformer of YBa{sub 2}Cu{sub 3}O{sub 7-x} to a Nb-PbIn SQUID. The low frequency (1/f) noise is dominated by fluctuations in the supercurrent circulating in the transformer, driven by vortex motion. The application of a small static magnetic field induces a supercurrent that reversibly suppresses the noise, in quantitative agreement with a model of thermally activated vortex hopping between symmetrical pairs of pinning sites. A persistent current can be used to reduce the low frequency noise power of high-{Tc} flux transformers by at least one order of magnitude. 11 refs., 4 figs., 1 tab.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10105319
- Report Number(s):
- LBL-31157; CONF-9106224-2; ON: DE92004306
- Resource Relation:
- Conference: Superconducting quantum interference devices (IC SQUID) meeting,Berlin (Germany),18-21 Jun 1991; Other Information: PBD: Aug 1991
- Country of Publication:
- United States
- Language:
- English
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