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We investigate the effect of eddy currents on ferromagnetic resonance (FMR)in ferromagnet-normal metal (FM/NM) bilayer structures. Eddy-current effectsare usually neglected for NM layer thicknesses below the microwave (MW) skindepth (approx. 800 nm for Au at 10 GHz). However, we show that in much thinnerNM layers (10-100 nm of Au or Cu) they induce a phase shift in the FMRexcitation when the MW driving field has a component perpendicular to thesample plane. This results in a strong asymmetry of the measured absorptionlines. In contrast to typical eddy-current effects, the asymmetry is larger forthinner NM layers and is tunable through changing the sample geometry and theNM layer thickness.

Eddy current interactions in a Ferromagnet-Normal metal bilayer structure, and its impact on ferromagnetic resonance lineshapes