[en] A detailed analysis of exchange coupling are made for sputtered [Sm-Co(21 nm)/Fe₆₅Co₃₅ or Co(x nm)]₁₀ (x = 5 or 7) multi-layered films. After annealing, a main phase obtained within the films is Sm₂Co₁₇. Transmission electron microscopic observation illustrates that the film exhibits a nano-particle structure and no multi-layer structure forms after annealing. δm measurements and remanence magnetization curves with applying field show that the increase in coercivity might be due to improving pinning effectiveness by decreasing Fe-Co layer thickness or changing from Fe-Co to Co layer. The recoil curves are analysed in detail for [Sm-Co(21 nm)/Fe₆₅Co₃₅(x nm)]₁₀ multi-layered films, which shows that the recoil susceptibility of the [Sm-Co(21 nm)/Fe₆₅Co₃₅(5 nm)]₁₀ film is lower and changes slowly. These results can be understood in terms of a pinning-type mechanism of coercivity and the exchange coupling between grains of hard and soft magnetic phases