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Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

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2023

Autor:innen

Alekhin, Alexandr
Lomonosov, Alexey M.
Leo, Naëmi
Vlasov, Vladimir S.
Kotov, Leonid
Gaal, Peter
Vavassori, Paolo
Temnov, Vasily

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Deutsche Forschungsgemeinschaft (DFG): AL2143/3-1

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Open Access-Veröffentlichung
Core Facility der Universität Konstanz

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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.3c02336

Zusammenfassung

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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Fachgebiet (DDC)
530 Physik

Schlagwörter

ultrafast magnetoacoustics, magnetization dynamics, picosecond ultrasonics, magnetic nanostructures, magnetic metasurfaces, Landau-Lifshitz-Gilbert equation

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ISO 690ALEKHIN, 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.3c02336
BibTex
@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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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
n&lt;sub&gt;th-&lt;/sub&gt;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
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