Evidence of electro-active excitation of the spin cycloid in TbMnO3

Abstract

Terahertz electromagnetic excitations in the multiferroic TbMnO3 at the field-induced magnetic transition are investigated for different orientations of the magnetic cycloid. In addition to the electromagnon along the a-axis, the detailed polarization analysis of the experimental spectra suggests the existence of an electro-active excitation for ac electric fields along the crystallographic c-axis. This excitation is possibly the electro-active eigenmode of the spin cycloid in TbMnO3, which has been predicted within the inverse Dzyaloshinskii-Moriya mechanism of magnetoelectric coupling.

5 pages

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• High magnetic field evolution of ferroelectricity in CuCrO2
• Infrared-active phonon modes in monoclinic multiferroic MnWO4
• Infrared reflectivity of the phonon spectra in multiferroic TbMnO3
• Soft-mode behavior of electromagnons in multiferroic manganite
• Magnetic order and electromagnon excitations in DyMnO3 studied by neutron scattering experiments
• Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling
• High-Frequency Electromagnon in GdMnO3
• Spin-wave dispersion and magnon chirality in multiferroic TbMnO3
• Modifying the magnetoelectric coupling in TbMnO${}_3$ by low-level Fe${}^{3+}$ substitution
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