Low Temperature Physics: 32, 809 (2006); https://doi.org/10.1063/1.2219502 (10 pages)
Физика Низких Температур: Том 32, Выпуск 8-9 (Август 2006), c. 1065-1077    ( к оглавлению , назад )

Adjustment of superconductivity and ferromagnetism in the few-layered ferromagnet-superconductor nanostructures

Y.A. Izyumov1, M.G. Khusainov2,3,4, Y.N. Proshin2,3

1Institute of Metal Physics, Ural Division of RAS, Ekaterinburg 620219, Russia
E-mail: Yurii.Proshin@ksu.ru

2Kazan State University, Kazan 420008, Russia

3Max-Planck-Institute for the Physics of Complex Systems, Dresden 01871, Germany

4«Vostok» branch, Kazan State Tupolev Technical University, Chistopol’ 422981, Russia

Received March 15, 2006, revised May 4, 2006


The phase diagrams of the few-layered nanosystems consisting of dirty superconducting (S) and ferromagnetic (F) metals are investigated within the framework of the modern theory of the proximity effect taking into account the boundary conditions. The F/S tetralayer and pentalayer are shown to have considerably richer physics than the F/S bi- and trilayer (due to the interplay between the 0 and p phase superconductivity and the 0 and p phase magnetism and nonequivalence of layers) and even the F/S superlattices. It is proven that these systems can have different critical temperatures and fields for different S layers. This predicted decoupled superconductivity is found to manifest itself in its most striking way for F/S tetralayer. It is shown that F/S/F'/S' tetralayer is the most perspective candidate for use in superconducting spin nanoelectronics.

74.78.Fk - Multilayers, superlattices, heterostructures
85.25.-j - Superconducting devices
74.62.-c - Transition temperature variations
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

Key words: proximity effect, superconductivity, ferromagnetism, multilayers, critical temperature.