Evidence for an electromagnon in GdMn2O5: A multiferroic with a large electric polarization

We report in this paper the dynamical properties of GdMn2O5 studied by inelastic neutron scattering and infrared spectroscopy assisted by ab initio calculations. Our work sheds light on the electromagnon, a magnetic mode that can be excited by an electric field. Combining spin-wave measurements, simulations, and ab initio calculations of the single-ion anisotropies and the superexchange interactions, we describe in detail the magnetic contribution to this mode. An exhaustive study of the temperature and polarization dependence of its electroactivity completes this comprehensive study of the complex GdMn2O5 system.

Automated summary

In this paper, the dynamical properties of GdMn2O5 were studied using inelastic neutron scattering and infrared spectroscopy assisted by ab initio calculations. The research sheds light on the presence of electromagnon, a magnetic mode that can be excited by an electric field. By combining various methods, including spin-wave measurements, simulations, and ab initio calculations, the magnetic contribution to this mode was described in detail, with an exhaustive study of its electroactivity completing the comprehensive investigation of the complex GdMn2O5 system.