Terahertz driven magnetization dynamics are explored in the orthoferrite DyFeO3. A high-field, single cycle THz pulse is used to excite magnon modes in the crystal together with other resonances. Both quasi-ferromagnetic and quasi-antiferromagnetic magnon modes are excited and appear in time-resolved measurements of the Faraday rotation. Other modes are also observed in the measurements of the time-resolved linear birefringence. Analysis of the excitation process reveals that despite larger than expected electro-optical susceptibility it is mainly the THz magnetic field that couples to the quasi-ferromagnetic and quasi-antiferromagnetic magnon branches.
@article{arxiv.1706.01545,
title = {Terahertz-driven magnetism dynamics in the orthoferrite DyFeO3},
author = {A. H. M. Reid and Th. Rasing and R. V. Pisarev and H. A. Dürr and M. C. Hoffmann},
journal= {arXiv preprint arXiv:1706.01545},
year = {2017}
}