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We have investigated the structural, magnetic and superconducting propertiesof [Nb(1.5nm)/Fe(x)]$_{10}$ superlattices deposited on a thick Nb(50nm) layer.Our investigation showed that the Nb(50nm) layer grows epitaxially at800$^\circ$C on Al$_2$O$_3$(1$\bar{1}$02) substrate. Samples grown at thiscondition posses a high residual resistivity ratio of 15-20. By using neutronreflectometry we show that Fe/Nb superlattices with $x<$ 4 nm form adepth-modulated FeNb alloy with concentration of iron varying between 60% and90%. This alloy has properties of a weak ferromagnet. Proximity of this weakferromagnetic layer to a thick superconductor leads to an intermediate phasethat is characterized by co-existing superconducting and normal-state domains.By increasing the thickness of the Fe layer to $x$ = 4 nm the intermediatephase disappears. We attribute the intermediate state to proximity inducednon-homogeneous superconductivity in the periodic Fe/Nb structure.

Proximity effect in [Nb(1.5nm)/Fe(x)]$_{10}$/Nb(50nm) superconducting/ferromagnet heterostructures