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Analysis of the time-resolved magneto-optical Kerr effect for ultrafast magnetization dynamics in ferromagnetic thin films

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Razdolski,  Ilya
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Alekhin,  Alexandr
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
IMMM UMR CNRS 6283, Universite du Maine;

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Melnikov,  Alexey
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Faculty of Physics, Martin Luther University of Halle-Wittenberg;

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Citation

Razdolski, I., Alekhin, A., Martens, U., Bürstel, D., Diesing, D., Münzenberg, M., et al. (2017). Analysis of the time-resolved magneto-optical Kerr effect for ultrafast magnetization dynamics in ferromagnetic thin films. Journal of Physics: Condensed Matter, 29(17): 174002. doi:10.1088/1361-648X/aa63c6.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-32AE-3
Abstract
We discuss fundamental aspects of laser-induced ultrafast demagnetization probed by the time-resolved magneto-optical Kerr effect (MOKE). Studying thin Fe films on MgO substrate in the absence of electronic transport, we demonstrate how to disentangle pump-induced variations of magnetization and magneto-optical coefficients. We provide a mathematical
formalism for retrieving genuine laser-induced magnetization dynamics and discuss its applicability in real experimental situations. We further stress the importance of temporal resolution achieved in the experiments and argue that measurements of both time-resolved MOKE rotation and ellipticity are needed for the correct assessment of magnetization
dynamics on sub-picosecond timescales. The framework developed here sheds light onto the details of the time-resolved MOKE technique and contributes to the understanding of the interplay between ultrafast laser-induced optical and magnetic effects.