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Antiferromagnetic Cavity Magnon Polaritons in Collinear and Canted Phases of Hematite

I. Boventer1,*, H. T. Simensen2, B. Brekke2, M. Weides3, A. Anane1, M. Kläui2,4,5, A. Brataas2, and R. Lebrun1,†

  • 1Unité Mixte de Physique CNRS, Thales, Université Paris-Saclay, Palaiseau 91767, France
  • 2Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, Trondheim NO-7491, Norway
  • 3James Watt School of Engineering, Electronics & Nanoscale Engineering Division, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 4Institut für Physik, Johannes-Gutenberg-Universität Mainz, D-55099, Mainz, Germany
  • 5Graduate School of Excellence Materials Science in Mainz (MAINZ), Staudinger Weg 9, D-55128, Mainz, Germany

  • *isabella.boventer@cnrs-thales.fr
  • †romain.lebrun@cnrs-thales.fr
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Phys. Rev. Applied 19, 014071 – Published 30 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014071

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-Fe2O3) 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.

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Phys. Rev. Applied 19, 014071– Published 30 January, 2023
  • Received 16 December 2021
  • Revised 5 December 2022
  • Accepted 7 December 2022
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