Antiferromagnetic cavity magnon polaritons in collinear and canted phases of hematite

Boventer, I., Simensen, H.T., Brekke, B., Weides, M. , Anane, A., Kläui, M., Brataas, A. and Lebrun, R. (2023) Antiferromagnetic cavity magnon polaritons in collinear and canted phases of hematite. Physical Review Applied, 19(1), 014071. (doi: 10.1103/PhysRevApplied.19.014071)

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Abstract

Cavity spintronics explores light-matter interactions at the interface between spintronic and quantum phenomena. Until now, studies have focused on the hybridization between magnons in ferromagnets and cavity photons. Here, we realize antiferromagnetic cavity magnon polaritons. Hybridization arises from the interaction of the collective spin motion in single hematite crystals (α- Fe 2 O 3 ) and the microwave field of integrated cavities operating between 18 and 45 GHz. We show theoretically and experimentally that the photon-magnon coupling in the collinear phase is mediated by the dynamic Néel vector and the weak magnetic moment in the canted phase by measuring across the Morin transition. We show that the coupling strength, ~ g , scales with the anisotropy field in the collinear phase and with the Dzyaloshinskii-Moriya field in the canted phase. We reach the strong-coupling regime in both canted (cooperativity C > 70 for selected modes at 300 K) and noncollinear phases (C > 4 at 150 K), and thus, towards coherent information-exchange-harnessing antiferromagnetic cavity magnon polaritons. These results provide evidence for a generic strategy to achieve cavity magnon polaritons in antiferromagnets for different symmetries, opening the field of cavity spintronics to antiferromagnetic materials.

Item Type:Articles
Additional Information:I.B. and R.L acknowledge support from the French Agence Nationale de la Recherche (ANR) under grant ANR-22-CE24-0008-03 (ICARUS). R.L., I. B., A.A. and M.K. acknowledge financial support from the Horizon 2020 Framework Programme of the European Commission under FET-Open grant agreement no. 863155 (s-Nebula). I. B. and R. L. acknowledges financial support from the Horizon 2020 Framework Programme of the European Commission under FET-Open grant agreement No. 964931 (TSAR). M.K. acknowledges support from the Graduate School of Excellence Materials Science in Mainz (MAINZ) DFG 266, the DAAD (Spintronics network, Project No. 57334897). M.K. acknowledges support from the DFG project number 423441604 and 268565370 (f Project A01). The Research Council of Norway supported H.T.S., B.B, M.K., and A.B. through its Centers of Excellence funding scheme, project number 262633 “QuSpin”.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Boventer, I., Simensen, H.T., Brekke, B., Weides, M., Anane, A., Kläui, M., Brataas, A., and Lebrun, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Applied
Publisher:American Physical Society
ISSN:2331-7019
ISSN (Online):2331-7019
Copyright Holders:Copyright © The Authors 2023
First Published:First published in Physical Review Applied 19(1):014071
Publisher Policy:Reproduced under a Creative Commons license

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