Anatomy of ultrafast quantitative magnetoacoustics in freestanding nickel thin films - Archive ouverte HAL
Article Dans Une Revue Physical Review B Année : 2023

Anatomy of ultrafast quantitative magnetoacoustics in freestanding nickel thin films

Antonia Ghita
Tudor-Gabriel Mocioi
Alexey Lomonosov
Jiwan Kim
  • Fonction : Auteur
Oleksandr Kovalenko
Paolo Vavassori

Résumé

We revisit the quantitative analysis of the ultrafast magnetoacoustic experiment in a freestanding nickel thin film by Kim and Bigot [J.-W. Kim and J.-Y. Bigot, Phys. Rev. B 95, 144422 (2017)] by applying our recently proposed approach of magnetic and acoustic eigenmode decomposition. We show that the application of our modeling to the analysis of time-resolved reflectivity measurements allows for the determination of amplitudes and lifetimes of standing perpendicular acoustic phonon resonances with unprecedented accuracy. The acoustic damping is found to scale as ∝ω2 for frequencies up to 80 GHz, and the peak amplitudes reach 10−3. The experimentally measured magnetization dynamics for different orientations of an external magnetic field agrees well with numerical solutions of magnetoelastically driven magnon harmonic oscillators. Symmetry-based selection rules for magnon-phonon interactions predicted by our modeling approach allow for the unambiguous discrimination between spatially uniform and nonuniform modes, as confirmed by comparing the resonantly enhanced magnetoelastic dynamics simultaneously measured on opposite sides of the film. Moreover, the separation of timescales for (early) rising and (late) decreasing precession amplitudes provide access to magnetic (Gilbert) and acoustic damping parameters in a single measurement.

Dates et versions

hal-04245786 , version 1 (17-10-2023)

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Antonia Ghita, Tudor-Gabriel Mocioi, Alexey Lomonosov, Jiwan Kim, Oleksandr Kovalenko, et al.. Anatomy of ultrafast quantitative magnetoacoustics in freestanding nickel thin films. Physical Review B, 2023, 107 (13), pp.134419. ⟨10.1103/PhysRevB.107.134419⟩. ⟨hal-04245786⟩
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