We have investigated the magnetic anisotropy and interlayer coupling in trilayer films of permendur(100 Å)/Ru/permalloy(100 Å), with the thickness of the Ru spacer varying from 0 to 200 Å. While the permendur/permalloy sample exhibits a small in-plane uniaxial magnetic anisotropy with Hu = 27 Oe, all trilayers are magnetically isotropic in-plane. Results from hysteresis loop and ferromagnetic resonance measurements were fitted to a micromagnetic model, with the results indicating that all the films are ferromagnetically coupled except the one with 10 Å Ru spacer, which shows antiferromagnetic coupling. The trilayers with Ru spacer layer thickness larger than 20 Å exhibit only very weak ferromagnetic coupling.
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