One of the main interests of this project is the dashing world of electromagnons. As the very word indicates, the electromagnons are electro-active magnons,82 namely collective spin and lattice excitations that couple the dielectric and magnetic properties. In that fashion, they contribute to both the dielectric and magnetic susceptibilities.
Since the electromagnons originate from the collective spin and lattice excitations, all the possible quantum-level microscopic mechanisms responsible for the multiferroic coupling are undoubtedly related to their generation. To remind the reader, there are two main possible coupling mechanisms: spin-orbit and spin-lattice. Within the spin-orbit coupling case, the spin-current (DM interaction) and the p-d hybridization (metal-ligand) can drive the system to a polar phase. Spin-current coupling mostly originates from non-collinear spin structures and it is a consequence of the antisymmetric superexchange interaction. On the other hand, spin-lattice interaction appears principally in systems with collinear spin order, where the symmetric exchange striction is the parent of the polarization induction. However, in many cases a combination of the above contributions may occur.