Magnetism and superconductivity in the superconductor/quasimagnet/ferromagnet Nb∕Pd∕Fe system

We have studied the superconducting properties of sputtered multilayers of Nb∕Pd∕Fe. This structure is expected to exhibit a double proximity effect as both superconducting and ferromagnetic orders propagate into the Pd layer from the interfaces with Nb and Fe, respectively. By measuring samples with varying Pd thickness, we estimated that double proximity is present in the Pd layers with thickness up to 40Å. Measurements of structural, superconducting, and magnetic behaviors, in samples with varying Fe thickness showed that the Pd spacer removes the alloying between Nb and Fe opening the way for the occurrence of reentrant superconducting effects in this system.