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Acoustic and optical ferromagnetic resonance (FMR) in the interlayer exchangecoupled Fe$_{20}$Ni$_{80}$/Co bilayer have been investigated. In the opticalmode, unexpected increasing tendencies of peak value at the resonance frequencyhas been observed under an increasing magnetic field. We presented analyticalcalculations with which the exchange coupling between Co and Fe$_{20}$Ni$_{80}$layers, the magnetization and the in-plane uniaxial anisotropy are taken intoaccount, to interpret the increasing of the maximum values of the opticalpermeability. Both experimental measurements and theoretical calculation showthat such tendencies are dependent on the layer thickness t, and that there isa critical field above which the optical peak value begins to decrease. Theseresults might help us to understand the mechanism of interlayer exchangecoupling induced optical FMR and might enlighten us to find new possibility ofhigh frequency applications of magnetic materials.

Anomalous increasing of the intensity of field dependence optical mode ferromagnetic resonance in the exchange coupled bilayer system