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

D. Bossini, M. Pancaldi, L. Soumah, M. Basini, F. Mertens, M. Cinchetti, T. Satoh, O. Gomonay, and S. Bonetti
Phys. Rev. Lett. 127, 077202 – Published 9 August 2021
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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. 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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  • Received 5 November 2020
  • Revised 22 May 2021
  • Accepted 24 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.077202

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. Bossini1,*, M. Pancaldi2, L. Soumah2, M. Basini2, F. Mertens3, M. Cinchetti3, T. Satoh4, O. Gomonay5, and S. Bonetti2,6

  • 1Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457 Konstanz, Germany
  • 2Department of Physics, Stockholm University, 106 91 Stockholm, Sweden
  • 3Experimentelle Physik VI, Technische Universität Dortmund, Otto-Hahn Straße 4, 44227 Dortmund, Germany
  • 4Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
  • 5Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany
  • 6Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, 30172 Venezia-Mestre, Italy

  • *davide.bossini@uni-konstanz.de

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Issue

Vol. 127, Iss. 7 — 13 August 2021

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