Two-magnon scattering and viscous Gilbert damping in ultrathin ferromagnets
Ferromagnetic resonance experiments of magnetic nanostructures over a large frequency range from 1 to 225 GHz 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 109 s–1, whereas the longitudinal Gilbert relaxation into the thermal bath is one to two orders of magnitude smaller.
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