Low 1/f flux noise in sputtered YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} bicrystal dc-superconducting quantum interference devices
- Istituto di Cibernetica del Consiglio Nazionale delle Ricerche, I-80072 Arco Felice (Napoli) (Italy)
- Istituto di Elettronica dello Stato Solido del Consiglio Nazionale delle Ricerche, I-00156 Roma (Italy)
YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} bicrystal dc-superconducting quantum interference devices (SQUIDs) and single layer magnetometers working at 77 K have been fabricated and analyzed. Samples have been made {ital in situ} by cylindrical magnetron dc sputtering on [001] SrTiO{sub 3} bicrystal 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 {mu}{Phi}{sub 0}Hz{sup {minus}1/2} in 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 high T{sub c} SQUIDs has been carried out, with special reference to the flux-to-voltage transfer parameter and noise characteristics. Finally, a reduction of 1/f noise of the SQUIDs has been achieved by a wide band bias reversal electronics. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 542562
- Journal Information:
- Journal of Applied Physics, Vol. 82, Issue 8; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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