Interlayer exchange coupling in multilayered Co/Os

► The interlayer exchange coupling (IEC) in Co/Osn/Co. ► Using the quantum well model, RKKY theory and the phase accumulation model. ► Phase accumulation model to describe the thickness dependence of QW states. ► Calculated Fermi surface including spin-orbit coupling of bulk Os. ► Shift of the AF coupling peaks due to QW interactions.