1/f Noise characteristics of SEJ Y-Ba-Cu-O Rf-SQUIDs on LaAlO3 substrate and the step structure, film, and temperature dependence

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dc.citation.epage1367en_US
dc.citation.issueNumber1en_US
dc.citation.spage1363en_US
dc.citation.volumeNumber11en_US
dc.contributor.authorFardmanesh, M.en_US
dc.contributor.authorSchubert, J.en_US
dc.contributor.authorAkram, R.en_US
dc.contributor.authorBick, M.en_US
dc.contributor.authorZhang, Y.en_US
dc.contributor.authorBanzet, M.en_US
dc.contributor.authorZander, W.en_US
dc.contributor.authorKrause, H. J.en_US
dc.contributor.authorBurkhart, H.en_US
dc.contributor.authorSchilling, M.en_US
dc.date.accessioned2015-07-28T11:56:22Z
dc.date.available2015-07-28T11:56:22Z
dc.date.issued2001-03en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractStep edge junction (SEJ) rf-SQUID magnetometers and gradiometers were fabricated using PLD Y-Ea-Cu-0 films on LaA10,(100) and SrTi0,(100) substrates. Effects of different step structure and the film properties on the yield, optimal operating temperature, and the l/f noise of the SQUIDs were investigated. The step structure was controlled using various IBE processes. The devices on LaAIO, showed higher sensitivity to the step structure compared to those on SrTiO,. This was due to re-deposition of substrate material at the steps prepared using the conventional IBE process resulting in a very low yield of unstable SQUIDs. High yield of low l/f noise stable SQUIDs was obtained on LaAIO, substrates with sharp steps prepared using an optimized IBE process. A typical l/f noise corner frequency of about lOHz at 77K with two major temperature dependencies was obtained. The temperature dependencies of the l/f noise could be correlated to the junction and the film of washer area of the SQUIDS. The white noise of our devices showed a dependency mainly on the amplitude of the flux to voltage transfer function signal. The operating temperature range of the SQUIDs could be controlled by the step structure and narrowed when the optimal operating temperature range was increased. All the measured junctions of our devices on the modified steps showed RSJ type behavior with a moderate decrease of the R, versus temperature.en_US
dc.identifier.doi10.1109/77.919604en_US
dc.identifier.issn1051-8223
dc.identifier.urihttp://hdl.handle.net/11693/10940
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/77.919604en_US
dc.source.titleIEEE Transactions on Applied Superconductivityen_US
dc.subjectSuperconductivityen_US
dc.subjectRf-squiden_US
dc.subjectYbcoen_US
dc.subject1/f Noiseen_US
dc.title1/f Noise characteristics of SEJ Y-Ba-Cu-O Rf-SQUIDs on LaAlO3 substrate and the step structure, film, and temperature dependenceen_US
dc.typeArticleen_US
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