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We propose a picture for the magnetic properties ofsuperconductor/ferromagnet (S/F) heterostructures based on Nb and permalloy(Py: Fe_{20}Ni_{80}). By measuring the magnetic moment as a function of thetemperature in S/F/S trilayers for different thicknesses of the middle F layer,we give evidence of the presence of a magnetic stray field of the F layer. Forvalues of F-layer thickness below a threshold, we establish a correlationbetween the magnetic measurements of the S/F/S trilayers and the anomalousmagnetic dependence of the critical current in S/insulator/thin superconductingfilm/F/S (SIsFS) Josephson junctions (JJs). These complementary investigationsprovide a self-consistent method to fully characterize S/F heterostructures andpossibly demonstrate effects arising from the mutual interactions betweenferromagnetism and superconductivity. A shift in the Fraunhofer criticalcurrent oscillations has been observed in the opposite direction to the onecommonly observed in JJs with F barriers, as it has been recently predicted byinverse and electromagnetic proximity theories. This inverse memory effect isrelevant for the design of these heterostructures as memory cells andspintronic devices.

Inverse magnetic hysteresis of the Josephson supercurrent: study of the magnetic properties of thin niobium/permalloy (Fe_{20}Ni_{80}) interfaces