Gilbert damping of magnetostatic modes in a yttrium iron garnet sphere

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2017
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Maier-Flaig, Hannes
Dubs, Carsten
Surzhenko, Oleskii
Gross, Rudolf
Huebl, Hans
Weiler, Mathias
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The magnetostatic mode (MSM) spectrum of a 300 μm diameter single crystalline sphere of yttrium iron garnet is investigated using broadband ferromagnetic resonance (FMR). The individual MSMs are identified via their characteristic dispersion relations, and the corresponding mode number tuples (nmr) are assigned. Taking FMR data over a broad frequency and magnetic field range allows one to analyze both the Gilbert damping parameter α and the inhomogeneous line broadening contribution to the total linewidth of the MSMs separately. The linewidth analysis shows that all MSMs share the same Gilbert damping parameter α = 2.7(5) × 10−5 irrespective of their mode index. In contrast, the inhomogeneous line broadening shows a pronounced mode dependence. This observation is modeled in terms of two-magnon scattering processes of the MSMs into the spin-wave manifold, mediated by surface and volume defects.

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ISO 690KLINGLER, Stefan, Hannes MAIER-FLAIG, Carsten DUBS, Oleskii SURZHENKO, Rudolf GROSS, Hans HUEBL, Sebastian T. B. GOENNENWEIN, Mathias WEILER, 2017. Gilbert damping of magnetostatic modes in a yttrium iron garnet sphere. In: Applied Physics Letters. American Institute of Physics (AIP). 2017, 110(9), 092409. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.4977423
BibTex
@article{Klingler2017Gilbe-51786,
  year={2017},
  doi={10.1063/1.4977423},
  title={Gilbert damping of magnetostatic modes in a yttrium iron garnet sphere},
  number={9},
  volume={110},
  issn={0003-6951},
  journal={Applied Physics Letters},
  author={Klingler, Stefan and Maier-Flaig, Hannes and Dubs, Carsten and Surzhenko, Oleskii and Gross, Rudolf and Huebl, Hans and Goennenwein, Sebastian T. B. and Weiler, Mathias},
  note={Article Number: 092409}
}
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