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(Color online) (a) Magnetization loop at for a square array of Pb rings after a zero field cooling procedure. The inset is a zoom in on the increasing field branch. (b) Scanning electron microscopy image of the array of Pb rings. (c) Cross section of the multilayered sample.
Normal/superconductor phase boundary, as determined by a 10% of the normal state resistance criterion, for the Al film deposited on top of the Pb rings after following different field cooling procedures.
(Color online) Schematic representation of the pinning properties of the rings after (a) zero field cooling and (b) field cooling.
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