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arXiv · 2103.11203

Ultrafast amplification and non-linear magneto-elastic coupling of coherent magnon modes in an antiferromagnet

D. Bossini·M. Pancaldi·L. Soumah·M. Basini·F. Mertens·M. Cinchetti·T. Satoh·O. Gomonay·S. Bonetti
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Abstract

We investigate the role of domain walls in the ultrafast magnon dynamics of an antiferromagnetic NiO single crystal in a pump-probe experiment with variable pump photon energy. Analysing the amplitude of the energy-dependent photo-induced ultrafast spin dynamics, we detect a yet unreported coupling between the material's characteristic THz- and a GHz-magnon modes. We explain this unexpected coupling between two orthogonal eigenstates of the corresponding Hamiltonian by modelling the magneto-elastic interaction between spins in different domains. We find that such interaction, in the non-linear regime, couples the two different magnon modes via the domain walls and it can be optically exploited via the exciton-magnon resonance.

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D. Bossini, M. Pancaldi, L. Soumah, M. Basini, F. Mertens, M. Cinchetti, T. Satoh, O. Gomonay, S. Bonetti. 2021-03-20. Ultrafast amplification and non-linear magneto-elastic coupling of coherent magnon modes in an antiferromagnet. https://doi.org/10.1103/physrevlett.127.077202

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