Magnon-phonon Fermi resonance in antiferromagnetic CoF2
2024; Nature Portfolio; Volume: 15; Issue: 1 Linguagem: Inglês
10.1038/s41467-024-49716-w
ISSN2041-1723
AutoresT. Metzger, K. A. Grishunin, Chris Reinhoffer, R. M. Dubrovin, Atiqa Arshad, Igor Ilyakov, Thales V. A. G. de Oliveira, Alexey Ponomaryov, Jan‐Christoph Deinert, Sergey Kovalev, R. V. Pisarev, M. I. Katsnelson, B. A. Ivanov, P. H. M. van Loosdrecht, A. V. Kimel, E. A. Mashkovich,
Tópico(s)Rare-earth and actinide compounds
ResumoAbstract Understanding spin-lattice interactions in antiferromagnets is a critical element of the fields of antiferromagnetic spintronics and magnonics. Recently, coherent nonlinear phonon dynamics mediated by a magnon state were discovered in an antiferromagnet. Here, we suggest that a strongly coupled two-magnon-one phonon state in this prototypical system opens a novel pathway to coherently control magnon-phonon dynamics. Utilizing intense narrow-band terahertz (THz) pulses and tunable magnetic fields up to μ 0 H ext = 7 T, we experimentally realize the conditions of magnon-phonon Fermi resonance in antiferromagnetic CoF 2 . These conditions imply that both the spin and the lattice anharmonicities harvest energy from the transfer between the subsystems if the magnon eigenfrequency f m is half the frequency of the phonon 2 f m = f ph . Performing THz pump-infrared probe spectroscopy in conjunction with simulations, we explore the coupled magnon-phonon dynamics in the vicinity of the Fermi-resonance and reveal the corresponding fingerprints of nonlinear interaction facilitating energy exchange between these subsystems.
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