Time-resolved observation of magnon splitting into vortex gyration and Floquet spin waves

Abstract

Forced excitations at frequencies in the range of the first order azimuthal spin waves of a magnetic disk in the vortex state are known to scatter into the vortex gyration mode, thereby allowing the growth of Floquet spin waves forming a frequency comb. We study the temporal emergence of this dynamical state using time-resolved microwave electrical measurements. The most intense Floquet mode emerges synchronously with the gyration mode after a common incubation delay which diverges at the scattering threshold. This delay is minimal when the drive is resonant with one of the first order azimuthal spin waves. It can be as short as 3 ns for the maximum investigated power. We conclude that the first-to-occur scattering mechanism is the three-wave splitting of a regular azimuthal eigenmode into a coherent pair formed by a gyration magnon and a Floquet spin wave.

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BibTeX RIS

BibTeX

@article{devolder2026timeresolved,
  title = {{Time-resolved observation of magnon splitting into vortex gyration and Floquet spin waves}},
  author = {T. Devolder and R. Lopes Seeger and C. Heins and A. Jenkins and L. C. Benetti and A. Schulman and R. Ferreira and G. Philippe and C. Chappert and H. Schultheiss and K. Schultheiss and J.-V. Kim},
  journal = {Physical Review Applied},
  year = {2026},
  month = jul,
  doi = {10.1103/kzlb-j3mw},
  eprint = {2511.10450},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05754675v1},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Time-resolved observation of magnon splitting into vortex gyration and Floquet spin waves
AU  - T. Devolder
AU  - R. Lopes Seeger
AU  - C. Heins
AU  - A. Jenkins
AU  - L. C. Benetti
AU  - A. Schulman
AU  - R. Ferreira
AU  - G. Philippe
AU  - C. Chappert
AU  - H. Schultheiss
AU  - K. Schultheiss
AU  - J.-V. Kim
PY  - 2026
DA  - 2026/07/13
JO  - Physical Review Applied
DO  - 10.1103/kzlb-j3mw
UR  - https://hal.science/hal-05754675v1
AB  - Forced excitations at frequencies in the range of the first order azimuthal spin waves of a magnetic disk in the vortex state are known to scatter into the vortex gyration mode, thereby allowing the growth of Floquet spin waves forming a frequency comb. We study the temporal emergence of this dynamical state using time-resolved microwave electrical measurements. The most intense Floquet mode emerges synchronously with the gyration mode after a common incubation delay which diverges at the scattering threshold. This delay is minimal when the drive is resonant with one of the first order azimuthal spin waves. It can be as short as 3 ns for the maximum investigated power. We conclude that the first-to-occur scattering mechanism is the three-wave splitting of a regular azimuthal eigenmode into a coherent pair formed by a gyration magnon and a Floquet spin wave.
SN  - 2331-7019
ER  -

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