https://doi.org/10.1140/epjb/e2004-00229-3
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
Leuven, Belgium
Corresponding author: a mathieu.morelle@fys.kuleuven.ac.be
Received:
26
February
2004
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
