Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal

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WEILER, Mathias, Aisha AQEEL, Maxim MOSTOVOY, Andrey LEONOV, Stephan GEPRÄGS, Rudolf GROSS, Hans HUEBL, Thomas T. M. PALSTRA, Sebastian T. B. GÖNNENWEIN, 2017. Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal. In: Physical Review Letters. American Physical Society (APS). 119(23), 237204. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.119.237204

@article{Weiler2017-12-08Helim-51787, title={Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal}, year={2017}, doi={10.1103/PhysRevLett.119.237204}, 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 Gönnenwein, Sebastian T. B.}, note={Article Number: 237204} }

Aqeel, Aisha 2020-11-13T13:42:11Z Weiler, Mathias Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal Palstra, Thomas T. M. terms-of-use Geprägs, Stephan Gönnenwein, Sebastian T. B. Weiler, Mathias Gross, Rudolf Palstra, Thomas T. M. Mostovoy, Maxim Gross, Rudolf Leonov, Andrey Leonov, Andrey We experimentally study magnetic resonances in the helical and conical magnetic phases of the chiral magnetic insulator Cu<sub>2</sub>OSeO<sub>3</sub> 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. Mostovoy, Maxim 2020-11-13T13:42:11Z Huebl, Hans Gönnenwein, Sebastian T. B. Geprägs, Stephan Huebl, Hans eng Aqeel, Aisha 2017-12-08

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