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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2505.09579 |
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| _version_ | 1866908389218451456 |
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| author | Gerevenkov, P. I. Mogunov, Ia. A. Filatov, Ia. A. Gusev, N. S. Sapozhnikov, M. V. Khokhlov, N. E. Kalashnikova, A. M. |
| author_facet | Gerevenkov, P. I. Mogunov, Ia. A. Filatov, Ia. A. Gusev, N. S. Sapozhnikov, M. V. Khokhlov, N. E. Kalashnikova, A. M. |
| contents | The development of magnonics requires energy-efficient methods for generating spin waves and controlling their parameters. Acoustic waves are known to resonantly excite spin waves through magneto-elastic wave formation or to induce non-resonant forced magnetization oscillations. Short acoustic wavepackets enable another unexplored resonant interaction regime -- the Cherenkov radiation of spin waves. This raises a question regarding the criteria and signatures of these three regimes of picosecond magnetoacoustics.Here, we use a scanning magneto-optical pump-probe technique to directly observe all three regimes of interaction between laser-driven acoustic and magnetostatic wavepackets in a thin permalloy film and a waveguide fabricated on Si substrate. Direct measurements of the phase velocities reveal the transition from a coupled magneto-elastic wavepacket to Cherenkov-like radiation and the non-resonant regime, controlled by the detuning between magnon and phonon group velocities. The acoustic pulse is found to be affected by the excited magnetization dynamics only in the magneto-elastic regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_09579 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Three regimes of a picosecond magnetoacoustics in ferromagnetic structures Gerevenkov, P. I. Mogunov, Ia. A. Filatov, Ia. A. Gusev, N. S. Sapozhnikov, M. V. Khokhlov, N. E. Kalashnikova, A. M. Materials Science The development of magnonics requires energy-efficient methods for generating spin waves and controlling their parameters. Acoustic waves are known to resonantly excite spin waves through magneto-elastic wave formation or to induce non-resonant forced magnetization oscillations. Short acoustic wavepackets enable another unexplored resonant interaction regime -- the Cherenkov radiation of spin waves. This raises a question regarding the criteria and signatures of these three regimes of picosecond magnetoacoustics.Here, we use a scanning magneto-optical pump-probe technique to directly observe all three regimes of interaction between laser-driven acoustic and magnetostatic wavepackets in a thin permalloy film and a waveguide fabricated on Si substrate. Direct measurements of the phase velocities reveal the transition from a coupled magneto-elastic wavepacket to Cherenkov-like radiation and the non-resonant regime, controlled by the detuning between magnon and phonon group velocities. The acoustic pulse is found to be affected by the excited magnetization dynamics only in the magneto-elastic regime. |
| title | Three regimes of a picosecond magnetoacoustics in ferromagnetic structures |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.09579 |