Local imaging of magnetic flux in superconducting thin films [Elektronische Ressource] / by Tetyana Shapoval

Local imaging of magnetic flux insuperconducting thin filmsDISSERTATIONfor the partial fulfillment of the requirements for the academic degree ofDoctor rerum naturalium(Dr.rer.nat.)submitted toFaculty of Mathematics and Natural SciencesTechnical University DresdenbyDipl.-Phys. Tetyana Shapovalborn on 6th June 1980 in Kyiv, UkraineDresden20101. Gutachter: Prof. Dr. Ludwig SchultzProfessur fu¨r Metallphysik Institut fu¨r Festko¨rperphysik TU DresdenDirektor des Institutes fur Metallische Werkstoffe¨und wissenschaftliche Direktor des IFW DresdenHelmholtzstrasse 20D-01069 Dresden2. Gutachter: Prof. Dr. Vitali MetlushkoAssociate Director for Nanofabrication TechnologiesProf. Electrical and Computer Engineeringand Director of the Nanotechnology Core Facility (NCF) (Senior Member IEEE)Department of Electrical and Computer EngineeringUniversity of Illinois at ChicagoIllinois 60612 USAEingereicht am: 15.09.2009Tag der Verteidigung: 26.01.2010AbstractLocal studies of magnetic flux line (vortex) distribution in superconducting thin films andtheir pinning by natural and artificial defects have been performed using low-temperaturemagnetic force microscopy (LT-MFM).Taken a 100 nm thin NbN film as an example, the depinning of vortices from naturaldefects under the influence of the force that the MFM tip exerts on the individual vortex wasvisualizedandthelocalpinningforcewasestimated.