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This paper describes ferromagnetic resonance ͑FMR͒ and magnetoresistive measurements of thin magnetic films coupled to antiferromagnetic films. First, FMR results for films of Ni 80 Fe 20 show that coupling to NiO produces the angular variation in the resonance field of the type expected for unidirectional exchange anisotropy. However, unidirectional anisotropy values measured by in-plane ferromagnetic resonance are roughly 20% less than the loop shift measured via magnetoresistance. Thedoi:10.1103/physrevb.58.8605 fatcat:4tbxzrrb5nginnazr66oejbwoy