Anisotropic wavevector-dependent damping of thickness-quantized magnons

Abstract

Magnon damping is a key factor governing spin-wave transport and nonlinear dynamics of multimode magnon systems. However, many descriptions rely on the assumption of an effective mode-independent parameter, which can mask wavelength-dependent relaxation processes that depend on propagation geometry and mode profile. Here, we employ high-resolution parametric-instability spectroscopy to probe thickness-quantized spin waves with wavelengths down to about a hundred nanometers in micrometer-thick yttrium iron garnet films. The instability threshold exhibits a regular sawtooth dependence on the magnetic field, arising from switching between discrete thickness modes. Comparison with dipole--exchange theory reveals anisotropic wavevector-dependent damping that increases with mode number and depends differently on the in-plane and out-of-plane wavevector components.

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BibTeX RIS

BibTeX

@misc{azevedo2026anisotropic,
  title = {{Anisotropic wavevector-dependent damping of thickness-quantized magnons}},
  author = {Tamara Azevedo and Rostyslav O. Serha and Yannik Kunz and Matthias R. Schweizer and Vitaliy I. Vasyuchka and Mathias Weiler and Andrii V. Chumak and Burkard Hillebrands and Mikhail Kostylev and Alexander A. Serga},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.39612},
  eprint = {2609.39612},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.39612},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Anisotropic wavevector-dependent damping of thickness-quantized magnons
AU  - Tamara Azevedo
AU  - Rostyslav O. Serha
AU  - Yannik Kunz
AU  - Matthias R. Schweizer
AU  - Vitaliy I. Vasyuchka
AU  - Mathias Weiler
AU  - Andrii V. Chumak
AU  - Burkard Hillebrands
AU  - Mikhail Kostylev
AU  - Alexander A. Serga
PY  - 2026
DA  - 2026/10/05
PB  - arXiv
DO  - 10.48550/arxiv.2609.39612
UR  - https://arxiv.org/abs/2609.39612
AB  - Magnon damping is a key factor governing spin-wave transport and nonlinear dynamics of multimode magnon systems. However, many descriptions rely on the assumption of an effective mode-independent parameter, which can mask wavelength-dependent relaxation processes that depend on propagation geometry and mode profile. Here, we employ high-resolution parametric-instability spectroscopy to probe thickness-quantized spin waves with wavelengths down to about a hundred nanometers in micrometer-thick yttrium iron garnet films. The instability threshold exhibits a regular sawtooth dependence on the magnetic field, arising from switching between discrete thickness modes. Comparison with dipole--exchange theory reveals anisotropic wavevector-dependent damping that increases with mode number and depends differently on the in-plane and out-of-plane wavevector components.
ER  -

Abstract

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