Dynamical Magnetoelectric Coupling in Helical Magnets
Dynamical Magnetoelectric Coupling in Helical Magnets
Collective mode dynamics of the helical magnets coupled to electric polarization via spin-orbit interaction is studied theoretically. The soft modes associated with the ferroelectricity are not the transverse optical phonons, as expected from the Lyddane-Sachs-Teller relation, but are the spin waves hybridized with the electric polarization. This leads to the …