Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal

Weiler M, Aqeel A, Mostovoy M, Leonov A, Gepraegs S, Gross R, Huebl H, Palstra TTM, Goennenwein STB (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Physical Review Letters American Physical Society

Book Volume: 119

Article Number: 237204

Journal Issue: 23

DOI: 10.1103/PhysRevLett.119.237204

Abstract

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.

Involved external institutions

University of Groningen / Rijksuniversiteit Groningen NL Netherlands (NL) Bayerische Akademie der Wissenschaften DE Germany (DE)

How to cite

APA:

Weiler, M., Aqeel, A., Mostovoy, M., Leonov, A., Gepraegs, S., Gross, R.,... Goennenwein, S.T.B. (2017). Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal. Physical Review Letters, 119(23). https://doi.org/10.1103/PhysRevLett.119.237204

MLA:

Weiler, Mathias, et al. "Helimagnon Resonances in an Intrinsic Chiral Magnonic Crystal." Physical Review Letters 119.23 (2017).

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