Trapping flux avalanches in Nb films by circular stop-holes of different size

Authors

D Carmo, Universidade Federal de São Carlos
F Colauto, Universidade Federal de São Carlos
A M H De Andrade, Universidade Federal do Rio Grande do Sul
A A M Oliveira, Instituto Federal de Educação
Wilson Aires Ortiz, Universidade Federal de São Carlos
Tom H. Johansen, University of Wollongong, University of OsloFollow

RIS ID

99884

Publication Details

Carmo, D., Colauto, F., De Andrade, A. M H., Oliveira, A. A M., Ortiz, W. A. & Johansen, T. H. (2015). Trapping flux avalanches in Nb films by circular stop-holes of different size. IEEE Transactions on Applied Superconductivity, 25 (3), 7501004-1-7501004-4.

Abstract

2014 IEEE. Dendritic flux avalanches triggered by thermomagnetic instabilities in Nb superconducting films have been limited by inclusion of circular holes of different diameters produced by optical lithography. We have observed a compromise between dendrite and hole sizes, for which avalanches are effectively arrested. For holes much smaller than the dendrites, only individual branches are stopped. Large holes are not a good solution, since they change the film geometry. A noteworthy trapping is observed at the holes with diameter between the width of an individual branch and the size of a whole dendrite. The present work shows the trend to optimize stop-holes for limiting thermomagnetic avalanches in superconducting films.