Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Magnetization Dynamics and Damping
MA 12.6: Talk
Tuesday, March 18, 2025, 10:45–11:00, H19
Ferromagnetic resonance linewidth as a probe for investigating magnon-phonon interaction — •Gauravkumar Patel1, Rodolfo Gallardo2, Ruslan Salikhov1, Sven Stienen1, Kilian Lenz1, Olav Hellwig1,3, and Jürgen Lindner1 — 1Helmholtz-Zentrum Dresden--Rossendorf, Dresden, Germany — 2Universidad Técnica Federico Santa María, Valpariso, Chille — 3Chemnitz University of Technology, 09107 Chemnitz
The Ferromagnetic resonance (FMR) linewidth measurements provide information about dynamic energy losses present in magnetic materials. For materials with high magnetoelastic coupling strength, like Co, the uniform precession can excite the elastic vibrations in the underlying lattice. Using the FMR linewidth as a probe, we investigate this magnon-phonon interaction in Co thin films on Pt seed layers. This interaction results in a non-monotonic behavior of the linewidth as a function of frequency, showing multiple peaks at specific frequencies, in contrast to the typical Gilbert-like linear dependence. The magnon-phonon coupling is more pronounced in Co thin films with higher perpendicular anisotropy. Variation of the Co or Pt layer thickness shifts the linewidth peak position, indicating control over the frequency of the generated phonon.
Keywords: Ferromagnetic Resonance; Magnon-Phonon Coupling; Linewidth Peak