Ferromagnetic resonance experiments of magnetic nanostructures over a large frequency range from 10.3em0exto0.3em0ex2250.3em0exGHz are presented. We find unambiguous evidence for a nonlinear frequency dependence of the linewidth. The viscous Gilbert damping and two-magnon scattering are clearly separated. Both angular and frequency dependent measurements give a transverse scattering rate within the magnetic subsystem of the order of 10⁹0.3em0exs^-1, whereas the longitudinal Gilbert relaxation into the thermal bath is one to two orders of magnitude smaller.
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Lenz et al. (2006) studied this question.
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