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Sm2Co17 thin films were deposited on a Cr underlayer by dc magnetron sputtering. Sm2Co17(300) in-plane texture was observed as the thickness of the Cr underlayer was in the range of 100–300 nm. The exchange coupling effect of the Sm2Co17 films was investigated from ΔM plots. The Cr underlayer was found to play an important role in decreasing the intergranular interactions in the Sm2Co17 films because of the formation of granular structure. TEM micrographs indicate that the magnetic decoupling can be due to isolated Sm2Co17 magnetic clusters which is induced by a Cr(110) textured underlayer.