Oscillations in both ferromagnetic and antiferromagnetic indirect exchange coupling through Ru are directly measured. Ferromagnetic coupling is determined by spin engineering multilayered structures comprised of trilayers of Ni₈₀{Co}₂₀$/Ru/${Ni}₈₀Co₂₀ in which one of the Ni₈₀{Co}₂₀$ layers is strongly antiferromagnetically pinned to a Co layer. Oscillations in antiferromagnetic exchange coupling are measured in companion ${Ni}₈₀Cu₂₀/Ru multilayers. The dependence of the exchange coupling strength on Ru thickness is well described by the Ruderman-Kittel-Kasuya-Yosida far-field range function, providing a direct measurement of this function through a transition metal.
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Parkin et al. (1991) studied this question.
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