Abstract
We report time-resolved Kerr effect measurements of magnetization dynamics in ferromagnetic SrRuO${}_{3}$. We observe that the demagnetization time slows substantially at temperatures within 15 K of the Curie temperature, which is $~$150 K. We analyze the data with a phenomenological model that relates the demagnetization time to the spin-flip time. In agreement with our observations, the model yields a demagnetization time that is inversely proportional to $T\ensuremath{-}{T}_{c}$. We also make a direct comparison of the spin-flip rate and the Gilbert damping coefficient, showing that their ratio is very close to ${k}_{B}{T}_{c}$, indicating a common origin for these phenomena.
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