Helicity-Changing Brillouin Light Scattering by Magnons in a Ferromagnetic Crystal

Abstract

Brillouin light scattering in ferromagnetic materials usually involves one magnon and two photons and their total angular momentum is conserved. Here, we experimentally demonstrate the presence of a helicity-changing two-magnon Brillouin light scattering in a ferromagetic crystal, which can be viewed as a four-wave mixing process involving two magnons and two photons. Moreover, we observe an unconventional helicity-changing one-magnon Brillouin light scattering, which apparently infringes the conservation law of the angular momentum. We show that the crystal angular momentum intervenes to compensate the missing angular momentum in the latter scattering process.

arXiv comment14 pages, 6 figures

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• Polarization dependent scattering in cavity optomagnonics
• Ultrafast Optomagnonics in Ferrimagnetic Multi-Sublattice Garnets
• Quantum measurement with recycled photons
• Polarization-selective magneto-optical modulation
• Optical interface for a hybrid magnon-photon resonator
• Chiral excitations and the intermediate-field spin-liquid regime in the Kitaev magnet $\alpha$-RuCl${}_3$