Low1/fflux noise in sputteredYBa2Cu3O7−xbicrystal dc-superconducting quantum interference devices
作者:
E. Sarnelli,
C. Camerlingo,
M. Russo,
G. Torrioli,
M. G. Castellano,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 82,
issue 8
页码: 3922-3927
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.365698
出版商: AIP
数据来源: AIP
摘要:
YBa2Cu3O7−xbicrystal dc-superconducting quantum interference devices (SQUIDs) and single layer magnetometers working at 77 K have been fabricated and analyzed. Samples have been madein situby cylindrical magnetron dc sputtering on [001]SrTiO3bicrystal substrates. Magnetic flux noise levels and magnetic field sensitivities by standard flux-locked-loop electronics have been measured out on dc-SQUIDs and magnetometers, respectively. Flux noise levels as low as a few&mgr;&Fgr;0Hz−1/2in the white noise regime have been measured in SQUIDs, whereas the magnetic field sensitivity of the magnetometers was influenced by external sources. A comparison of experimental data with analytical expressions modelling the behavior of highTcSQUIDs has been carried out, with special reference to the flux-to-voltage transfer parameter and noise characteristics. Finally, a reduction of1/fnoise of the SQUIDs has been achieved by a wide band bias reversal electronics. ©1997 American Institute of Physics.
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