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arXiv · 1008.0674

Determination of the spin-flip time in ferromagnetic SrRuO3 from time-resolved Kerr measurements

C. L. S. Kantner·M. C. Langner·W. Siemons·J. L. Blok·G. Koster·A. J. H. M. Rijnders·R. Ramesh·J. Orenstein
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Abstract

We report time-resolved Kerr effect measurements of magnetization dynamics in ferromagnetic SrRuO3. We observe that the demagnetization time slows substantially at temperatures within 15K of the Curie temperature, which is ~ 150K. 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 very close to kBTc, indicating a common origin for these phenomena.

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C. L. S. Kantner, M. C. Langner, W. Siemons, J. L. Blok, G. Koster, A. J. H. M. Rijnders, R. Ramesh, J. Orenstein. 2010-08-03. Determination of the spin-flip time in ferromagnetic SrRuO3 from time-resolved Kerr measurements. https://doi.org/10.1103/physrevb.83.134432

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