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A new type of magnetic shield has been Constructed for use with superconducting microelectronic circuits or other circuits requiring low ambient magnetic fields. Experimental verification of the basic flux sweeping action and flux expulsion is demonstrated for a wide range of conditions. The optimum temperature for flux sweeping is shown to be in a narrow window rather close to Tcwhere the vortices are relatively mobile.
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Fang et al. (1987) studied this question.
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