We show that for a thin superconducting platelet placed in a perpendicular dc magnetic field, the application of a weak ac magnetic field in the plane of the platelet generates a dc electric field in the superconductor that causes the critical currents and irreversible magnetic moment to relax completely. This relaxation process is not due to thermally activated flux creep but due to the drift of vortices under the influence of the ac field. Generalizing our previous theories of transverse and longitudinal shaking in a superconducting strip, we show that in realistic superconducting samples of rectangular shape the generated dc electric field is anisotropic and in general is not parallel to the currents circulating in the critical state. This leads to anisotropic relaxation of the irreversible currents with the appearance of novel current loops.
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Mikitik et al. (2004) studied this question.
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