Hybridizing ferromagnetic magnons and microwave photons in the quantum limit

Abstract

We demonstrate large normal-mode splitting between a magnetostatic mode (the Kittel mode) in a ferromagnetic sphere of yttrium iron garnet and a microwave cavity mode. Strong coupling is achieved in the quantum regime where the average number of thermally or externally excited magnons and photons is less than one. We also confirm that the coupling strength is proportional to the square root of the number of spins. A nonmonotonic temperature dependence of the Kittel-mode linewidth is observed below 1 K and is attributed to the dissipation due to the coupling with a bath of two-level systems.

arXiv comment5 pages, 4 figures

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• Long-distance strong coupling of magnon and photon: Effect of multi-mode waveguide
• Detection of Ferromagnetic Resonance from 1 nm-thick Co
• Cryogenic Magnomechanics for Thermometry Applications