Vortex patterns and nucleation of superconductivity in mesoscopic rectangles and in hybrid superconductor/ferromagnet structures
Nanoscale Superconductivity and Magnetism Group, Laboratory for Solid State Physics and Magnetism, K.U. Leuven, Celestijnenlaan 200D, 3001
Corresponding author: a email@example.com
Published online: 3 August 2004
Nucleation of superconductivity and vortex patterns have been studied in mesoscopic samples providing the crossover between square and rectangular geometries. The measured nucleation line, , has been analyzed in the framework of the linearized Ginzburg-Landau theory. A very good agreement has been found between the theoretical boundary and the experimental data for rectangles with different aspect ratios. The superconductor/ferromagnet hybrids, such as magnetic Co/Pd dot in a superconducting loop and the dot on top of a superconducting disk have also been investigated. Pronounced effects of the dot on the boundary have been found, including strong asymmetry with respect to the field polarity.
PACS: 74.25.Dw – Superconductivity phase diagrams / 74.78.Na – Mesoscopic and nanoscale systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004