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(a) A square lattice of magnetic dots with linearly increasing size on top of a superconducting film and an oxide layer. (b) The stray field of each dot may induce V-Av molecules in the superconductor (Ref. 6).
The GL free energy of the superconducting state as a function of the magnetization of the magnetic dots (field-cooled regime). [(a)–(e)] Local magnetic field distribution in the sample for representative V-Av configurations (, 2, 4, 6, and 13 antivortices per row, respectively), and comparison with MD simulations [(f) and (g)].
The evolution of the Cooper-pair condensate (and its energy) under the gradiated array of magnetic dots as a function of temperature (for ).
The S/N phase boundary obtained by transport measurements, compared to the case of demagnetized dots and the theoretical data (for , , and ). The insets show the Cooper-pair density plots at values denoted by open dots.
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