Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal

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2017
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Weiler, Mathias
Aqeel, Aisha
Mostovoy, Maxim
Leonov, Andrey
Geprägs, Stephan
Gross, Rudolf
Huebl, Hans
Palstra, Thomas T. M.
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Physical Review Letters. American Physical Society (APS). 2017, 119(23), 237204. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.119.237204
Zusammenfassung

We experimentally study magnetic resonances in the helical and conical magnetic phases of the chiral magnetic insulator Cu2OSeO3 at the temperature T=5  K. Using a broadband microwave spectroscopy technique based on vector network analysis, we identify three distinct sets of helimagnon resonances in the frequency range 2  GHz≤f≤20  GHz with low magnetic damping α≤0.003. The extracted resonance frequencies are in accordance with calculations of the helimagnon band structure found in an intrinsic chiral magnonic crystal. The periodic modulation of the equilibrium spin direction that leads to the formation of the magnonic crystal is a direct consequence of the chiral magnetic ordering caused by the Dzyaloshinskii-Moriya interaction. The mode coupling in the magnonic crystal allows excitation of helimagnons with wave vectors that are multiples of the spiral wave vector.

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ISO 690WEILER, Mathias, Aisha AQEEL, Maxim MOSTOVOY, Andrey LEONOV, Stephan GEPRÄGS, Rudolf GROSS, Hans HUEBL, Thomas T. M. PALSTRA, Sebastian T. B. GOENNENWEIN, 2017. Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal. In: Physical Review Letters. American Physical Society (APS). 2017, 119(23), 237204. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.119.237204
BibTex
@article{Weiler2017-12-08Helim-51787,
  year={2017},
  doi={10.1103/PhysRevLett.119.237204},
  title={Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal},
  number={23},
  volume={119},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Weiler, Mathias and Aqeel, Aisha and Mostovoy, Maxim and Leonov, Andrey and Geprägs, Stephan and Gross, Rudolf and Huebl, Hans and Palstra, Thomas T. M. and Goennenwein, Sebastian T. B.},
  note={Article Number: 237204}
}
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    <dcterms:abstract xml:lang="eng">We experimentally study magnetic resonances in the helical and conical magnetic phases of the chiral magnetic insulator Cu&lt;sub&gt;2&lt;/sub&gt;OSeO&lt;sub&gt;3&lt;/sub&gt; at the temperature T=5  K. Using a broadband microwave spectroscopy technique based on vector network analysis, we identify three distinct sets of helimagnon resonances in the frequency range 2  GHz≤f≤20  GHz with low magnetic damping α≤0.003. The extracted resonance frequencies are in accordance with calculations of the helimagnon band structure found in an intrinsic chiral magnonic crystal. The periodic modulation of the equilibrium spin direction that leads to the formation of the magnonic crystal is a direct consequence of the chiral magnetic ordering caused by the Dzyaloshinskii-Moriya interaction. The mode coupling in the magnonic crystal allows excitation of helimagnons with wave vectors that are multiples of the spiral wave vector.</dcterms:abstract>
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