Back to Search
Start Over
Ultrafast amplification and non-linear magneto-elastic coupling of coherent magnon modes in an antiferromagnet
- Source :
- Phys. Rev. Lett. 127, 077202 (2021)
- Publication Year :
- 2021
-
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.<br />Comment: 6 pages, 4 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 127, 077202 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2103.11203
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.127.077202