Origin of electromagnon excitations in \textit{R}MnO${}_3$

Abstract

The origin of electromagnon excitations in cycloidal \textit{R}MnO${}_3$ is explained in terms of the Heisenberg coupling between spins despite the fact that the static polarization arises from the much weaker Dzyaloshinskii-Moriya (DM) exchange interaction. We present a model that incorporates structural characteristics of this family of manganites that is confirmed by far infrared transmission data as a function of temperature and magnetic field and inelastic neutron scattering results. A deep connection is found between the magnetoelectric dynamics of the spiral phase and the static magnetoelectric coupling in the collinear E-phase of this family of manganites.

4 pages, 3 figures, submitted

References in corpus (3)

• Spin current and magneto-electric effect in non-collinear magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Colossal magnon-phonon coupling in multiferroic Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$

Cited by in corpus (5)

• Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Striped Multiferroic Phase in Double-Exchange Model for Quarter-Doped Manganites
• Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO${}_3$
• Electro-spinon in one-dimensional Mott insulator