Abstract
In thin superconducting platelets or films in perpendicular d.c. magnetic field, the application of a weak in-plane a.c. magnetic field perpendicular to the d.c. field causes the irreversible currents to relax rapidly. This “vortex shaking” effect allows, e.g., to measure the reversible magnetic moment in spite of vortex pinning. We explain it first for a long strip with the in-plane a.c. field perpendicular or parallel to the strip axis (transverse or longitudinal shaking) and finally for realistic rectangular platelets with any side ratio. In rectangles the different relaxation rates of currents flowing in different directions lead to the appearance of a novel spatial structure with multiple current loops.
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