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arXiv · 2308.01052

Impulsive Fermi magnon-phonon resonance in antiferromagnetic $CoF_{2}$

Thomas W. J. Metzger·Kirill A. Grishunin·Chris Reinhoffer·Roman M. Dubrovin·Atiqa Arshad·Igor Ilyakov·Thales V. A. G. de Oliveira·Alexey Ponomaryov·Jan-Christoph Deinert·Sergey Kovalev·Roman V. Pisarev·Mikhail I. Katsnelson·Boris A. Ivanov·Paul H. M. van Loosdrecht·Alexey V. Kimel·Evgeny A. Mashkovich
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Abstract

Understanding spin-lattice interactions in antiferromagnets is one of the most fundamental issues at the core of the recently emerging and booming fields of antiferromagnetic spintronics and magnonics. Recently, coherent nonlinear spin-lattice coupling was discovered in an antiferromagnet which opened the possibility to control the nonlinear coupling strength and thus showing a novel pathway to coherently control magnon-phonon dynamics. Here, utilizing intense narrow band terahertz (THz) pulses and tunable magnetic fields up to 7 T, we experimentally realize the conditions of the Fermi magnon-phonon resonance in antiferromagnetic $CoF_{2}$. These conditions imply that both the spin and the lattice anharmonicities harvest energy transfer between the subsystems, if the magnon eigenfrequency $f_{m}$ is twice lower than the frequency of the phonon $2f_{m}=f_{ph}$. 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 an impulsive THz-induced response. This study focuses on the role of nonlinearity in spin-lattice interactions, providing insights into the control of coherent magnon-phonon energy exchange.

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Thomas W. J. Metzger, Kirill A. Grishunin, Chris Reinhoffer, Roman M. Dubrovin, Atiqa Arshad, Igor Ilyakov, Thales V. A. G. de Oliveira, Alexey Ponomaryov, Jan-Christoph Deinert, Sergey Kovalev, Roman V. Pisarev, Mikhail I. Katsnelson, Boris A. Ivanov, Paul H. M. van Loosdrecht, Alexey V. Kimel, Evgeny A. Mashkovich. 2023-08-02. Impulsive Fermi magnon-phonon resonance in antiferromagnetic $CoF_{2}$. https://doi.org/10.1038/s41467-024-49716-w

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