Publikation:

Exchange-Enhanced Ultrastrong Magnon-Magnon Coupling in a Compensated Ferrimagnet

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2019

Autor:innen

Liensberger, Lukas
Maier-Flaig, Hannes
Geprägs, Stephan
Erb, Andreas
Gross, Rudolf
Huebl, Hans
Weiler, Mathias

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http://nbn-resolving.de/urn:nbn:de:bsz:352-2-26n08oi3jct04
DOI (zitierfähiger Link)
https://doi.org/10.1103/PhysRevLett.123.117204
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http://arxiv.org/abs/1903.04330

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Physical Review Letters. 2019, 123(11), 117204. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.123.117204

Zusammenfassung

We experimentally study the spin dynamics in a gadolinium iron garnet single crystal using broadband ferromagnetic resonance. Close to the ferrimagnetic compensation temperature, we observe ultrastrong coupling of clockwise and counterclockwise magnon modes. The magnon-magnon coupling strength reaches almost 40% of the mode frequency and can be tuned by varying the direction of the external magnetic field. We theoretically explain the observed mode coupling as arising from the broken rotational symmetry due to a weak magnetocrystalline anisotropy. The effect of this anisotropy is exchange enhanced around the ferrimagnetic compensation point.

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530 Physik

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ISO 690LIENSBERGER, Lukas, Akashdeep KAMRA, Hannes MAIER-FLAIG, Stephan GEPRÄGS, Andreas ERB, Sebastian T. B. GOENNENWEIN, Rudolf GROSS, Wolfgang BELZIG, Hans HUEBL, Mathias WEILER, 2019. Exchange-Enhanced Ultrastrong Magnon-Magnon Coupling in a Compensated Ferrimagnet. In: Physical Review Letters. 2019, 123(11), 117204. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.123.117204
BibTex
@article{Liensberger2019-03-11T14:41:10ZExcha-45447.2,
  year={2019},
  doi={10.1103/PhysRevLett.123.117204},
  title={Exchange-Enhanced Ultrastrong Magnon-Magnon Coupling in a Compensated Ferrimagnet},
  number={11},
  volume={123},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Liensberger, Lukas and Kamra, Akashdeep and Maier-Flaig, Hannes and Geprägs, Stephan and Erb, Andreas and Goennenwein, Sebastian T. B. and Gross, Rudolf and Belzig, Wolfgang and Huebl, Hans and Weiler, Mathias},
  note={Article Number: 117204}
}
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2*
 2019-09-16 06:48:04
Published in Physical Review Letters
1
 2019-03-13 12:43:20
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