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The magnetic properties of Co/Bi/Co samples were investigated. The thickness of Co layers was equal to 5 nm and the thickness of Bi layers, tBi, was varied from 0.2 to 50 nm. It was discovered that the value of the saturation field, HS, of the studied samples oscillates with increasing tBi from 0.2 to 50 nm. This fact was explained by the existence of oscillating exchange interaction between ferromagnetic Co layers through Bi interlayer with changing tBi.