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We predict the decoupled superconductivity for the four-layered F′/S′/F″/S″ nanostructure consisting of dirty superconducting (S) and ferromagnetic (F) metals. The predicted hierarchy of critical temperatures is found to manifest itself in its most striking way through arising of different critical temperatures in different superconducting layers S′ and S″. In common case the phase diagram including four different regions is found. Conceptual sketch of the new control nanodevice based on this tetralayer system are proposed. It is shown that they can have up to seven various states. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

We propose the exchange model of proximity effect in the ferromagnetic insulator/superconductor/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. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

For the ferromagnetic metal/superconductor/ferromagnetic metal (F/S/F) trilayer we take into account the spatial variations of the pair amplitude not only across the F/S boundaries (the 1D case) but also along these interfaces (the 3D case). Our 3D model of the proximity effect also involves an indirect interaction of the both F layers magnetizations via the S layer. It leads to competition not only between the 1D and 3D LOFF states, but also between the antiferromagnetic and ferromagnetic superconducting states of the F/S/F trilayer. Possible nanodevices are discussed. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]