Abstract-Terahertz-driven magnetism dynamics in the orthoferrite DyFeO3

A. H. M. Reid, Th. Rasing, R. V. Pisarev, H. A. Dürr, M. C. Hoffmann

(Submitted on 5 Jun 2017)

      https://arxiv.org/abs/1706.01545

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.