Spin-wave coupling to electromagnetic cavity fields in dysposium ferrite

Abstract

Coupling of spin-waves with electromagnetic cavity field is demonstrated in an antiferromagnet, dysprosium ferrite (DyFeO3). By measuring transmission at 0.2-0.35 THz and sweeping sample temperature, magnon-photon coupling signatures were found at crossings of spin-wave resonances with Fabry-Perot cavity modes formed in samples. The obtained spectra are explained in terms of classical electrodynamics and a microscopic model.

arXiv comment3 pages, 2 figures

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• Antiferromagnetic resonance in $\alpha$-Fe${}_2$O${}_3$ up to its Néel temperature
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• Cavity-mediated coupling of antiferromagnetic spin waves
• Hybridization of terahertz phonons and magnons in disparate and spatially-separated material specimens
• Terahertz magnon-polaritons control using a tunable liquid crystal cavity
• Ultrastrong magnon-photon coupling in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies