Effects of the step structure on the yield, operating temperature, and the noise in step-edge Josephson junction rf-SQUID magnetometers and gradiometers

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dc.citation.epage44en_US
dc.citation.issueNumber1-4en_US
dc.citation.spage40en_US
dc.citation.volumeNumber354en_US
dc.contributor.authorFardmanesh, M.en_US
dc.contributor.authorSchubert, J.en_US
dc.contributor.authorBanzet, M.en_US
dc.contributor.authorZander, W.en_US
dc.contributor.authorZhang, Y.en_US
dc.contributor.authorKrause, H. J.en_US
dc.date.accessioned2019-02-04T11:31:34Z
dc.date.available2019-02-04T11:31:34Z
dc.date.issued2001en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractStep-edge Josephson junction rf-SQUID magnetometers and gradiometers were made using YBCO films on LaAlO3(1 0 0) and SrTiO3(1 0 0) substrates. Designs with 150×150 μm2 loop and 3.6 mm diameter washer area for the magnetometers (230 pH), and 1.5 mm baseline and 1.5 mm diameter washer areas with a loop of 75×75 μm2 for the Gradiometers (490 pH) were used. Effects of the step structure on the yield, optimal operating temperature range, and the 1/f noise of the devices were investigated. The step structure was controlled using different ion beam etching (IBE) processes. The devices on LaAlO3 showed high sensitivity to the IBE parameters and the step structure while this was much less for the SrTiO3 substrate samples. This is mainly due to a considerable re-deposition of the substrate material on the step during the IBE process, in particular for LaAlO3, resulting in very low yield and high 1/f noise devices. The film structure at the step was also found to be essentially dependent on the step structure strongly affecting the 1/f noise of the devices. Using an optimized “combinational IBE” process, surface modified sharp steps were prepared resulting in high yield of low 1/f noise devices when combined with high quality YBCO film. A typical 1/f noise corner frequency of less than about 10 Hz with a white noise level of about 20 μΦo/Hz at liquid nitrogen temperature was obtained for these devices. The devices have shown stability over many thermal cycles and the time (over half a year since their fabrication) while kept at the room temperature environment. The operating temperature range of the devices was found to be controllable by the step depth and the film thickness for the steps.en_US
dc.description.provenanceSubmitted by Ebru Kaya (ebrukaya@bilkent.edu.tr) on 2019-02-04T11:31:34Z No. of bitstreams: 1 Effects_of_the_step_structure_on_the_yield_operating_tempeture_and_the_noise.pdf: 175364 bytes, checksum: ec44eabfba85f9e41daa3b550386ed2d (MD5)en
dc.description.provenanceMade available in DSpace on 2019-02-04T11:31:34Z (GMT). No. of bitstreams: 1 Effects_of_the_step_structure_on_the_yield_operating_tempeture_and_the_noise.pdf: 175364 bytes, checksum: ec44eabfba85f9e41daa3b550386ed2d (MD5) Previous issue date: 2001en
dc.identifier.doi10.1016/S0921-4534(01)00019-3en_US
dc.identifier.issn0921-4534
dc.identifier.urihttp://hdl.handle.net/11693/48797
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttps://doi.org/10.1016/S0921-4534(01)00019-3en_US
dc.source.titlePhysica C: Superconductivity and its Applicationsen_US
dc.subjectrf-SQUIDen_US
dc.subjectPulsed laser deposition YBCOen_US
dc.subjectStep-edge Josephson junctionen_US
dc.subject1/f noiseen_US
dc.titleEffects of the step structure on the yield, operating temperature, and the noise in step-edge Josephson junction rf-SQUID magnetometers and gradiometersen_US
dc.typeArticleen_US

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