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We demonstrate the growth of epitaxial Fe/Ba(Fe(1-x)Co(x))2As2 (Fe/Ba-122)bilayers on MgO(001) and LSAT(001) single crystal substrates using Pulsed LaserDeposition (PLD). By exploiting the metallic nature of the FeAs tetrahedron inthe Ba-122 crystal structure, we achieve a coherent interfacial bond betweenbcc iron and Co-doped Ba-122. Tc values for both bilayers were close to that ofthe PLD target. Direct observation of interfacial bonding between Fe and theBa-122 FeAs sublattice by atomic resolution transmission electron microscopyimplies that this bilayer architecture may work for other iron pnictide systemsand pave the way for the fabrication of superconducting/ferromagneticheterostructures.

Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers