Theory of electromagnon in the multiferroic Mn perovskites: Vital role of higher harmonic components of the spiral spin order

Abstract

We study theoretically the electromagnon and its optical spectrum (OS) of the terahertz-frequency regime in the magnetic-spiral-induced multiferroic phases of the rare-earth (R) Mn perovskites, RMnO3, taking into account the elliptical deformation or the higher harmonics of the spiral spin configuration, which has been missed so far. A realistic spin Hamiltonian, which gives phase diagrams in agreement with experiments, resolves a long standing puzzle, i.e., the double-peak structure of the OS with a larger low-energy peak originating from magnon modes hybridized with the zone-edge state. We also predict the magnon branches associated with the electromagnon, which can be tested by neutron-scattering experiment.

arXiv comment5 pages, 4 figures

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• Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO${}_3$
• Electric-dipole active two-magnon excitation in {\textit{ab}} spiral spin phase of a ferroelectric magnet Gd${}_{\text{0.7}}$Tb${}_{\text{0.3}}$MnO${}_{\text{3}}$

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• Spin-wave dispersion and magnon chirality in multiferroic TbMnO3
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• Exotic Spin Phases in Two Dimensional Spin-orbit Coupled Models: Importance of Quantum Fluctuation Effects
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• Numerical Simulation of Spin-Chirality Switching in Multiferroics via Intense Electromagnon Excitations
• Theory of Magnetic-Field-Induced Polarization Flop in Spin-Spiral Multiferroics
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• Modeling and Physics of Multiferroic Perovskite Manganites
• Magnetic-field-induced critical dynamics in magnetoelectric TbPO${}_4$
• Elastic and magnetoelastic properties of TbMnO3 single crystal by nanosecond time resolved acoustics and first-principles calculations