1. Magnetic field-induced weak-to-strong-link transformation in patterned superconducting films
- Author
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Chaves, D. A. D., Valerio-Cuadros, M. I., Jiang, L., Abbey, E. A., Colauto, F., Oliveira, A. A. M., Andrade, A. M. H., Pinheiro, L. B. L. G., Johansen, T. H., Xue, C., Zhou, Y. -H., Silhanek, A. V., Ortiz, W. A., and Motta, M.
- Subjects
Condensed Matter - Superconductivity ,Condensed Matter - Materials Science ,Physics - Accelerator Physics ,Physics - Applied Physics - Abstract
Ubiquitous in most superconducting materials and a common result of nanofabrication processes, weak-links are known for their limiting effects on the transport of electric currents. Still, they are at the root of key features of superconducting technology. By performing quantitative magneto-optical imaging experiments and thermomagnetic model simulations, we correlate the existence of local maxima in the magnetization loops of FIB-patterned Nb films to a magnetic field-induced weak-to-strong-link transformation increasing their critical current. This phenomenon arises from the nanoscale interaction between quantized magnetic flux lines and FIB-induced modifications of the device microstructure. Under an ac drive field, this leads to a rectified vortex motion along the weak-link. The reported tunable effect can be exploited in the development of new superconducting electronic devices, such as flux pumps and valves, to attenuate or amplify the supercurrent through a circuit element, and as a strategy to enhance the critical current in weak-link-bearing devices., Comment: 11 pages and 8 figures
- Published
- 2023