Hidden harmonies: Team discovers magnon–phonon Fermi resonance in an antiferromagnet

https://phys.org/news/2024-08-hidden-harmonies-team-magnonphonon-fermi.html

"quantum antiferromagnets more energy-efficient (not using electrons produces less heat), 1,000X faster (due to magnons/ phonons coexisting in cobalt difluoride), more abundant than ferromagnets... excite spin dynamics by coupling with THz pulses, tuning center frequency by high external magnetic field up to several Tesla, enabling spin resonance frequencies to half the lattice vibration frequency (Fermi resonance)... hybridized 2-magnon-1-phonon state... pathway to spin-lattice coupling manipulation on demand"

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