Magnetically controlled superconducting weak links

van de Vondel, J.; Silhanek, A. V.; Raes, B.; Gillijns, W.; Kramer, R. B. G.; Moshchalkov, V. V.; Sautner, J.; Metlushko, V.
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p032501
Academic Journal
We have designed and characterized a magnetic template which can be switched between chains of parallel and antiparallel field distribution by applying an in-plane magnetic field. The parallel field profile creates highly mobile vortex channels in a superconducting film deposited on top, reproducing the behavior of a weak link as evidenced by the presence of Shapiro steps in the current-voltage characteristics under rf excitation. The Josephson coupling can be fully suppressed by changing the field distribution to the antiparallel state. As a result, a reversible ON/OFF switch for magnetically induced weak links has been demonstrated.


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