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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Published on: July 20, 2022

Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces.

Alexandr Alekhin^1,2, Alexey M Lomonosov³, Naëmi Leo²

¹Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Cité, UMR 7162 CNRS, Paris 75013, France.

|October 11, 2023

Summary

This summary is machine-generated.

This study uses ultrafast magneto-optics to explore nickel gratings, revealing acoustic wave dynamics and resonant excitations. Findings advance understanding of magnetoacoustics for nanoscale metasurface design.

Keywords:

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

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Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Ultrafast laser excitation drives complex dynamics in magnetic nanostructures.
Understanding laser-induced acoustic waves is crucial for nanoscale device applications.

Purpose of the Study:

Investigate ultrafast dynamics in nickel gratings using femtosecond time-resolved magneto-optics.
Identify and characterize surface acoustic modes and their interaction with magnetic properties.

Main Methods:

Femtosecond time-resolved magneto-optics applied to nickel gratings on various substrates.
Analysis of nanoscale acoustic wavelengths as spatial harmonics of surface acoustic waves.
Numerical solutions of the Landau-Lifshitz-Gilbert (LLG) equation.

Main Results:

Generated multiple surface acoustic modes up to tens of GHz.
Identified nanoscale acoustic wavelengths as spatial harmonics of Rayleigh SAW and SSLW.
Observed resonant magnetoelastic excitation of FMR and parametric resonance phenomena.

Conclusions:

Results provide a quantitative understanding of ultrafast fs-laser-driven magnetoacoustics.
Experimental and theoretical framework established for tailoring magnetic-grating-based metasurfaces.
Demonstrated agreement between experimental observations and theoretical calculations.