Resonant phonon-magnon interactions in freestanding metal-ferromagnet multilayers acting as acoustic cavities

A. Ghita; T. Mocioi; U. Vernik; A. M. Lomonosov; J. Kim; P. Vavassori; V. V. Temnov

doi:10.1117/12.2682306

28 September 2023 Resonant phonon-magnon interactions in freestanding metal-ferromagnet multilayers acting as acoustic cavities

A. Ghita, T. Mocioi, U. Vernik, A. M. Lomonosov, J. Kim, P. Vavassori, V. V. Temnov

Author Affiliations +

Proceedings Volume 12656, Spintronics XVI; 1265609 (2023) https://doi.org/10.1117/12.2682306
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

While most ultrafast time-resolved optical pump-probe experiments in magnetic materials reveal the spatially homogeneous magnetization dynamics of ferromagnetic resonance (FMR), here we explore the magneto-elastic generation of GHz-to-THz frequency spin waves (exchange magnons). Using analytical magnon oscillator equations, we apply time-domain and frequency-domain approaches to quantify the results of ultrafast time-resolved optical pump-probe experiments in free-standing ferromagnetic thin films. Simulations show excellent agreement with the experiment, provide acoustic and magnetic (Gilbert) damping constants and highlight the role of symmetry-based selection rules in phonon-magnon interactions. The analysis is extended to hybrid multilayer structures to explore the limits of resonant phonon-magnon interactions up to THz frequencies.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

A. Ghita, T. Mocioi, U. Vernik, A. M. Lomonosov, J. Kim, P. Vavassori, and V. V. Temnov "Resonant phonon-magnon interactions in freestanding metal-ferromagnet multilayers acting as acoustic cavities", Proc. SPIE 12656, Spintronics XVI, 1265609 (28 September 2023); https://doi.org/10.1117/12.2682306

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