Determination of the spin-flip time in ferromagnetic SrRuO3 from time-resolved Kerr measurements
Kantner, C.L.S., M.C. Langner, W. Siemons, J.L. Blok, G. Koster, A.J.H.M. Rijnders, Ramamoorthy Ramesh, J. Orenstein
We report time-resolved Kerr effect measurements of magnetization dynamics in ferromagnetic SrRuO3. 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-Tc. 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 BTc, indicating a common origin for these phenomena. © 2011 American Physical society.
Physical Review B - Condensed Matter and Materials Physics
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