Publikation: Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces
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Femtosecond (fs) time-resolved magneto-optics is applied to investigate laser-excited ultrafast dynamics of onedimensional nickel gratings on fused silica and silicon substrates for a wide range of periodicities Λ = 400-1500 nm. Multiple surface acoustic modes with frequencies up to a few tens of GHz are generated. Nanoscale acoustic wavelengths Λ /n have been identified as nth-spatial harmonics of Rayleigh surface acoustic wave (SAW) and surface skimming longitudinal wave (SSLW), with acoustic frequencies and lifetimes being in agreement with theoretical calculations. Resonant magnetoelastic excitation of the ferromagnetic resonance (FMR) by SAW’s third spatial harmonic, and, most interestingly fingerprints of the parametric resonance at 1/2 SAW frequency have been observed. Numerical solutions of Landau-Lifshitz-Gilbert (LLG) equation magnetoelastically driven by complex polychromatic acoustic fields quantitatively reproduce all resonances at once. Thus, our results provide a solid experimental and theoretical base for a quantitative understanding of ultrafast fs-laser-driven magnetoacoustics and tailoring the magnetic-gratingbased metasurfaces at the nanoscale.
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ALEKHIN, Alexandr, Alexey M. LOMONOSOV, Naëmi LEO, Markus LUDWIG, Vladimir S. VLASOV, Leonid KOTOV, Alfred LEITENSTORFER, Peter GAAL, Paolo VAVASSORI, Vasily TEMNOV, 2023. Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces. In: Nano Letters. American Chemical Society (ACS). 2023, 23(20), S. 9295-9302. ISSN 1530-6984. eISSN 1530-6992. Verfügbar unter: doi: 10.1021/acs.nanolett.3c02336BibTex
@article{Alekhin2023-10-11Quant-68133, year={2023}, doi={10.1021/acs.nanolett.3c02336}, title={Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces}, number={20}, volume={23}, issn={1530-6984}, journal={Nano Letters}, pages={9295--9302}, author={Alekhin, Alexandr and Lomonosov, Alexey M. and Leo, Naëmi and Ludwig, Markus and Vlasov, Vladimir S. and Kotov, Leonid and Leitenstorfer, Alfred and Gaal, Peter and Vavassori, Paolo and Temnov, Vasily} }
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