Exchange Model of Proximity Effect For F/S Nanostructures

We propose the exchange model of proximity effect in the ferromagnetic insulator/erconductor/ferromagnetic insulator (F/S/F) trilayers. This model takes into account the long range antiferromagnetic indirect RKKY exchange between localized spins placed at the F/S boundaries through superconducting electrons of the S layers as well as direct ferromagnetic exchange of nearest neighbors in the F layers. We propose new control devices based on the three-layered F/S/F nanostructures and combining the advantages of the superconducting and magnetic data-record channels in a single sample.