Impulsive Fermi magnon-phonon resonance in antiferromagnetic $Co{F}_2$

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 $Co{F}_2$. 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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• Spin Oscillations in Antiferromagnetic NiO Triggered by Circularly Polarized Light
• Terahertz-Light Driven Coupling of Antiferromagnetic Spins to Lattice
• Terahertz field-induced nonlinear coupling of two magnon modes in an antiferromagnet
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• Dynamical response of noncollinear spin systems at constrained magnetic moments
• Competition between terahertz magnetoelectric and Néel spin-orbit torque driven spin dynamics in metallic antiferromagnets
• Rational Control of Magnonic and Electronic Band Splittings
• Topological characterization of magnon-polaron bands and thermal Hall conductivity in a frustrated kagome antiferromagnet
• Anomalous Hall effect from nonlinear magnetoelectric coupling
• Development of a magnetic interatomic potential for cubic anti-ferromagnets: the case of NiO