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Ultrafast Amplification and Nonlinear Magnetoelastic Coupling of Coherent Magnon Modes in an Antiferromagnet

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2021

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Pancaldi, Matteo
Soumah, Lucile
Basini, Martina
Mertens, Fabian
Cinchetti, Mirko
Satoh, Takuya
Gomonay, Olena
Bonetti, Stefano

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https://doi.org/10.1103/PhysRevLett.127.077202
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Physical Review Letters. American Physical Society (APS). 2021, 127(7), 077202. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.127.077202

Zusammenfassung

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. Analyzing the amplitude of the energy-dependent photoinduced ultrafast spin dynamics, we detect a yet unreported coupling between the material’s characteristic terahertz- and gigahertz-magnon modes. We explain this unexpected coupling between two orthogonal eigenstates of the corresponding Hamiltonian by modeling the magnetoelastic interaction between spins in different domains. We find that such interaction, in the nonlinear 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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ISO 690BOSSINI, Davide, Matteo PANCALDI, Lucile SOUMAH, Martina BASINI, Fabian MERTENS, Mirko CINCHETTI, Takuya SATOH, Olena GOMONAY, Stefano BONETTI, 2021. Ultrafast Amplification and Nonlinear Magnetoelastic Coupling of Coherent Magnon Modes in an Antiferromagnet. In: Physical Review Letters. American Physical Society (APS). 2021, 127(7), 077202. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.127.077202
BibTex
@article{Bossini2021Ultra-54543,
  year={2021},
  doi={10.1103/PhysRevLett.127.077202},
  title={Ultrafast Amplification and Nonlinear Magnetoelastic Coupling of Coherent Magnon Modes in an Antiferromagnet},
  number={7},
  volume={127},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Bossini, Davide and Pancaldi, Matteo and Soumah, Lucile and Basini, Martina and Mertens, Fabian and Cinchetti, Mirko and Satoh, Takuya and Gomonay, Olena and Bonetti, Stefano},
  note={Article Number: 077202}
}
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