Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

Alexandr Alekhin; Alexey M. Lomonosov; Naëmi Leo; Markus Ludwig; Vladimir S. Vlasov; Leonid Kotov; Alfred Leitenstorfer; Peter Gaal; Paolo Vavassori; Vasily Temnov

doi:10.1021/acs.nanolett.3c02336

Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

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

Université de Paris
CIC nanoGUNE
Offenburg University of Applied Sciences
c/o DESY
Laboratoire des Solides Irradiés
University of Konstanz
Leibniz-Institut für Kristallzüchtung
CIBERfes

Research output: Contribution to journal › Article › peer-review

Abstract

Femtosecond (fs) time-resolved magneto-optics is applied to investigate laser-excited ultrafast dynamics of one-dimensional 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_th-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-grating-based metasurfaces at the nanoscale.

Original language	English
Pages (from-to)	9295-9302
Number of pages	8
Journal	Nano Letters
Volume	23
Issue number	20
DOIs	https://doi.org/10.1021/acs.nanolett.3c02336
Publication status	Published - 25 Oct 2023

Keywords

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

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10.1021/acs.nanolett.3c02336

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@article{006bd06fc4ac4ad6b55d89af71d29c10,

title = "Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces",

abstract = "Femtosecond (fs) time-resolved magneto-optics is applied to investigate laser-excited ultrafast dynamics of one-dimensional 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{\textquoteright}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-grating-based metasurfaces at the nanoscale.",

keywords = "Landau−Lifshitz−Gilbert equation, magnetic metasurfaces, magnetic nanostructures, magnetization dynamics, picosecond ultrasonics, ultrafast magnetoacoustics",

author = "Alexandr Alekhin and Lomonosov, \{Alexey M.\} and Na{\"e}mi Leo and Markus Ludwig and Vlasov, \{Vladimir S.\} and Leonid Kotov and Alfred Leitenstorfer and Peter Gaal and Paolo Vavassori and Vasily Temnov",

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doi = "10.1021/acs.nanolett.3c02336",

language = "English",

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T1 - Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

AU - Alekhin, Alexandr

AU - Lomonosov, Alexey M.

AU - Leo, Naëmi

AU - Ludwig, Markus

AU - Vlasov, Vladimir S.

AU - Kotov, Leonid

AU - Leitenstorfer, Alfred

AU - Gaal, Peter

AU - Vavassori, Paolo

AU - Temnov, Vasily

PY - 2023/10/25

Y1 - 2023/10/25

N2 - Femtosecond (fs) time-resolved magneto-optics is applied to investigate laser-excited ultrafast dynamics of one-dimensional 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-grating-based metasurfaces at the nanoscale.

AB - Femtosecond (fs) time-resolved magneto-optics is applied to investigate laser-excited ultrafast dynamics of one-dimensional 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-grating-based metasurfaces at the nanoscale.

KW - Landau−Lifshitz−Gilbert equation

KW - magnetic metasurfaces

KW - magnetic nanostructures

KW - magnetization dynamics

KW - picosecond ultrasonics

KW - ultrafast magnetoacoustics

UR - https://www.scopus.com/pages/publications/85175270990

U2 - 10.1021/acs.nanolett.3c02336

DO - 10.1021/acs.nanolett.3c02336

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AN - SCOPUS:85175270990

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VL - 23

SP - 9295

EP - 9302

JO - Nano Letters

JF - Nano Letters

IS - 20

ER -

Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

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