Thermodynamic properties of ferromagnetic/superconductor/ferromagnetic nanostructures

Details Thermodynamic properties of ferromagnetic/superconductor/ferromagnetic nanostructures Thermodynamic properties of ferromagnetic/superconductor/ferromagnetic nanostructures

2002-09-19

arxiv.org/abs/cond-mat/0209466v1

Physics

Condensed Matter

Superconductivity

20 pages, 5 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.67.014523

The theoretical description of the thermodynamic properties of ferromagnetic/superconductor/ferromagnetic (F/S/F) systems of nanoscopic scale is proposed. Their superconducting characteristics strongly depend on the mutual orientation of the ferromagnetic layers. In addition, depending on the transparency of S/F interfaces, the superconducting critical temperature can exhibit four different types of dependences on the thickness of the F-layer. The obtained results permit to give some practical recommendations for the spin-valve effect experimental observation. In this spin-valve sandwich, we also expect a spontaneous transition from parallel to anti-parallel ferromagnetic moment orientation, due to the gain in the superconducting condensation energy.

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