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arXiv · 1904.11273

Spin-wave propagation in metallic CoFe films determined by microfocused frequency-resolved magneto-optic Kerr effect

Lukas Liensberger·Luis Flacke·David Rogerson·Matthias Althammer·Rudolf Gross·Mathias Weiler
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Abstract

We investigated the magnetization dynamics of a patterned Co$_{25}$Fe$_{75}$-based heterostructure with a novel optical measurement technique that we call microfocused frequency-resolved magneto optic Kerr effect ($\mu$FR-MOKE). We measured the magnetic field dependence of the dynamical spin-wave susceptibility and recorded a spatial map of the spin-waves excited by a microwave antenna. We compare these results to those obtained on the same sample with the established microfocused Brillouin light scattering technique. With both techniques, we find a spin-wave propagation length of 5.6$\mu$m at 10GHz. Furthermore, we measured the dispersion of the wavevector and the spin-wave propagation length as a function of the external magnetic field. These results are in good agreement with existing literature and with the employed Kalinkos-Slavin model.

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Lukas Liensberger, Luis Flacke, David Rogerson, Matthias Althammer, Rudolf Gross, Mathias Weiler. 2019-04-25. Spin-wave propagation in metallic CoFe films determined by microfocused frequency-resolved magneto-optic Kerr effect. https://doi.org/10.1109/lmag.2019.2918755

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