Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions

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2023
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Nature Communications. Springer. 2023, 14(1), 1818. eISSN 2041-1723. Available under: doi: 10.1038/s41467-023-37509-6
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Antiferromagnetic materials have been proposed as new types of narrowband THz spintronic devices owing to their ultrafast spin dynamics. Manipulating coherently their spin dynamics, however, remains a key challenge that is envisioned to be accomplished by spin-orbit torques or direct optical excitations. Here, we demonstrate the combined generation of broadband THz (incoherent) magnons and narrowband (coherent) magnons at 1 THz in low damping thin films of NiO/Pt. We evidence, experimentally and through modeling, two excitation processes of spin dynamics in NiO: an off-resonant instantaneous optical spin torque in (111) oriented films and a strain-wave-induced THz torque induced by ultrafast Pt excitation in (001) oriented films. Both phenomena lead to the emission of a THz signal through the inverse spin Hall effect in the adjacent heavy metal layer. We unravel the characteristic timescales of the two excitation processes found to be < 50 fs and > 300 fs, respectively, and thus open new routes towards the development of fast opto-spintronic devices based on antiferromagnetic materials.

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ISO 690RONGIONE, Enzo, Oliver GUECKSTOCK, Maximilian MATTERN, Olena GOMONAY, H. MEER, Christian SCHMITT, Rafael RAMOS, Sebastian T. B. GOENNENWEIN, Tom S. SEIFERT, Romain LEBRUN, 2023. Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions. In: Nature Communications. Springer. 2023, 14(1), 1818. eISSN 2041-1723. Available under: doi: 10.1038/s41467-023-37509-6
BibTex
@article{Rongione2023-03-31Emiss-67113,
  year={2023},
  doi={10.1038/s41467-023-37509-6},
  title={Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions},
  number={1},
  volume={14},
  journal={Nature Communications},
  author={Rongione, Enzo and Gueckstock, Oliver and Mattern, Maximilian and Gomonay, Olena and Meer, H. and Schmitt, Christian and Ramos, Rafael and Goennenwein, Sebastian T. B. and Seifert, Tom S. and Lebrun, Romain},
  note={Article Number: 1818}
}
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