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Superconducting MgB2 thin films were prepared on 50-micrometer-thick,flexible polyamide Kapton-E foils by vacuum co-deposition of Mg and Bprecursors with nominal thickness of about 100 nm and a special ex-situ rapidannealing process in an Ar or vacuum atmosphere. In the optimal annealingprocess, the Mg-B films were heated to approximately 600 C, but at the sametime, the backside of the structures was attached to a water-cooled radiator toavoid overheating of the plastic substrate. The resulting MgB2 films wereamorphous with the onset of the superconducting transition at T_(c,on) about 33K and the transition width of approximately 3 K. The critical current densitywas > 7x10^5 A/cm^2 at 4.2 K, and its temperature dependence indicated agranular film composition with a network of intergranular weak links. The filmscould be deposited on large-area foils (up to 400 cm^2) and, after processing,cut into any shapes (e.g., stripes) with scissors or bent multiple times,without any observed degradation of their superconducting properties.Comment: 3 figure

Superconducting properties of MgB2 thin films prepared on flexible plastic substrates