Fabrication of high-temperature superconducting nanobridges using atomic force microscopy

dc.contributor.advisorPerold, W. J.
dc.contributor.advisorMeincken, M.
dc.contributor.authorElkaseh, Akram Abdulsalamen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.
dc.descriptionThesis (MEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
dc.description.abstractThe Josephson effect of high-temperature superconducting nanobridge structures is studied worldwide. Until now, nanobridges are generally fabricated with focused ion beam milling on planar thin films. These nanobridges are employed as weak links in superconducting quantum interference devices (SQUIDs) and used in superconducting flux flow transistors and devices. This project had two main objectives: to improve the sidewall angle of photoresist lines, with the aid of atomic force microscopy (AFM) nanolithography; and to fabricate hightemperature Josephson junctions by constricting superconductive YBCO lines on MgO substrates with AFM nanolithography. The entire fabrication process is explained including photolithography, deposition of the YBCO thin films with pulsed laser deposition (PLD), nanolithography and wet etching. Although the testing of the junctions did not show any Josephson behaviour, it could be demonstrated that nanobridge structures can successfully be created by AFM nanolithography. The entire fabrication process has been demonstrated in detail for the benefit of future research.en_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.subjectAtomic force microscopyen
dc.subjectJosephson effecten
dc.subjectPulsed laser depositionen
dc.subjectDissertations -- Electronic engineeringen
dc.subjectTheses -- Electronic engineeringen
dc.titleFabrication of high-temperature superconducting nanobridges using atomic force microscopyen_ZA
dc.rights.holderUniversity of Stellenbosch

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