Nb/NiCu bilayers in single and stacked superconductive tunnel junctions: preliminary results

Abstract We present preliminary experimental results concerning both single and stacked tunnel junctions in which one of the electrodes was formed by a superconductor/ferromagnet (S/F) bi-layer. In particular, in the stacked configuration a Nb/NiCu bi-layer was used as the intermediate electrode, and it was probed by tunneling on both sides. Tunnel junctions have been characterized in terms of current–voltage characteristics (IVC), and differential conductance. Preliminary steady-state injection–detection measurements performed in the stacked devices at T=4.2 K are also presented and discussed.