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Heterostructures consisting of a cuprate superconductor YBa2Cu3O7x and aruthenate/manganite (SrRuO3/La0.7Sr0.3MnO3) spin valve have been studied bySQUID magnetometry, ferromagnetic resonances and neutron reflectometry. It wasshown that due to the influence of magnetic proximity effect a magnetic momentis induced in the superconducting part of heterostructure and at the same timethe magnetic moment is suppressed in the ferromagnetic spin valve. Theexperimental value of magnetization induced in the superconductor has the sameorder of magnitude with the calculations based on the induced magnetic momentof Cu atoms due to orbital reconstruction at the superconductor-ferromagneticinterface. It corresponds also to the model that takes into account the changein the density of states at a distance of order of the coherence length in thesuperconductor. The experimentally obtained characteristic length ofpenetration of the magnetic moment into superconductor exceeds the coherencelength for cuprate superconductor. This fact points on the dominance of themechanism of the induced magnetic moment of Cu atoms due to orbitalreconstruction.

Magnetic proximity effect at interface between a cuprate superconductor and an oxide spin valve