Spin pumping in strongly coupled magnon-photon systems

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2016
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Maier-Flaig, Hannes
Harder, Michael
Gross, Rudolf
Huebl, Hans
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We experimentally investigate magnon polaritons arising in ferrimagnetic resonance experiments in a microwave cavity with a tunable quality factor. To this end, we simultaneously measure the electrically detected spin pumping signal and the microwave reflection (the ferrimagnetic resonance signal) of a yttrium iron garnet (YIG)/platinum (Pt) bilayer in the microwave cavity. The coupling strength of the fundamental magnetic resonance mode and the cavity is determined from the microwave reflection data. All features of the magnetic resonance spectra predicted by first principle calculations and an input-output formalism agree with our experimental observations. By changing the decay rate of the cavity at constant magnon-photon coupling rate, we experimentally tune in and out of the strong coupling regime and successfully model the corresponding change of the spin pumping signal and microwave reflection. Furthermore, we observe the coupling and spin pumping of several spin wave modes and provide a quantitative analysis of their coupling rates to the cavity.

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ISO 690MAIER-FLAIG, Hannes, Michael HARDER, Rudolf GROSS, Hans HUEBL, Sebastian T. B. GOENNENWEIN, 2016. Spin pumping in strongly coupled magnon-photon systems. In: Physical Review B. American Physical Society (APS). 2016, 94(5), 054433. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.94.054433
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@article{MaierFlaig2016-01-21T15:38:10Zpumpi-51795,
  year={2016},
  doi={10.1103/PhysRevB.94.054433},
  title={Spin pumping in strongly coupled magnon-photon systems},
  number={5},
  volume={94},
  issn={2469-9950},
  journal={Physical Review B},
  author={Maier-Flaig, Hannes and Harder, Michael and Gross, Rudolf and Huebl, Hans and Goennenwein, Sebastian T. B.},
  note={Article Number: 054433}
}
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