We have determined the absolute value of the interlayer exchange coupling constant ${\mathit{A}}_{12}$ of sputtered Co/Ru multilayers using Brillouin light scattering. The spin-wave frequencies, and therefore ${\mathit{A}}_{12}$, are found to oscillate as a function of the Ru layer thickness with a period of 11.5 Å. Detailed calculations show that the spin-wave frequency oscillations result from the canting of layer magnetizations in the antiferromagnetic coupling regimes.

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