This paper presents the investigations of structural and magnetic properties of multilayer system ferromagnetic/metallic separator/ferromagnetic. The investigation factors included structural properties (by means of X-ray dyifraction), surface and interface topology, roughness (X-ray reflectometry) and magnetic properties. Also the impact of both thickness of metallic separator and ferromagnetic sublayers and a number of bilayers repetition on magnetic properties was also investigated. The presented results of the investigation allow for drawing the following conclusions:

• it was proved on the basics of the investigations of multilayer systems ferromagnetic/metallic separator/ferromagnetic with different thickness of magnetic and non-magnetic layer than presence of ferromagnetic (F-F) and antiferromagnetic (A-F) exchange couplings depend on the quality of layers in artificial superlattice and on the state and type of free surface, superlattice structure and its roughness,
• it was proved that presence of ferromagnetic (F-F) and antiferromagnetic (A-F) exchange couplings depend on the state and type of free surface,
• it was proved that presence of ferromagnetic (F-F) and antiferromagnetic (A-F) exchange couplings depend on the superlattice structure and its roughness,
• antiferromagnetic exchange coupling depends on the thickness of the ferromagnetic layer (t_Ni = 14Å; 15Å and 16Å),
• no antiferromagnetic coupling (A-F I and A-F II) was observed for particular thicknesses of non-magnetic layer in multilayer systems, probably due to non-periodical growth of the layers and increased roughness in upper, lower and interface layers.

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