Angle-dependent x-ray magnetic circular dichroism experiments have been performed at both the Co and Pt L 2,3 edges in two epitaxial ͑111͒ CoPt 3 thin films grown at 690 and 800 K. The analysis of the angular variations of the 3d orbital magnetic moment shows two different magnetic behaviors: a strong perpendicular magnetocrystalline anisotropy ͑PMA͒ for the film grown at 690 K and an almost isotropic behavior for the film grown at higher temperature. The same analysis at the Pt L 2,3 edges suggests that the 5d electrons play an important role in the PMA. Our results correlate the appearance of PMA with the existence of anisotropic structural effects induced during the codeposition process. ͓S0163-1829͑98͒07534-1͔

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