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By means of time-resolved Kerr spectroscopy experiments we relate the energydissipation processes on the femtosecond (electron-spin relaxation time$\tau_{el-sp}$) and nanosecond timescale (Gilbert relaxation $\tau_{\alpha}$)and compare the results to the first microscopic model, which was proposed byKoopmans. For both energy dissipation processes, Elliot-Yafet scattering isproposed as the dominant contributor. We controllably manipulate the energydissipation processes by transition metal doping (Pd) and rare earth doping(Dy) of a Permalloy film and find that while a change of $\tau_{\alpha}$ ofmore than a factor two is observed, \tau_{el-sp}$ remains constant, contrary tothe predictions of the model. We explain the discrepancies by relaxationchannels not considered in the original microscopic model and identify therebythe applicability of the model and possible necessary extensions to the model.

Energy equilibriation processes of electrons, magnons and phonons on the femtosecond timescale