Magneto-electric excitations in multiferroic TbMnO3 by Raman scattering

Abstract

Low energy excitations in the multiferroic material TbMnO3 have been investigated by Raman spectroscopy. Our observations reveal the existence of two peaks at 30 cm-1 and 60 cm-1. They are observed in the cycloidal phase below the Curie temperature but not in the sinusoidal phase, suggesting their magnetoelectric origin. While the peak energies coincide with the frequencies of electromagnons measured previously by transmission spectroscopy, they show surprisingly different selection rules, with the 30 cm-1 excitation enhanced by the electric field of light along the spontaneous polarization. The origins of the modes are discussed under Raman and infrared selection rules considerations.

References in corpus (12)

• Spin current and magneto-electric effect in non-collinear magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites
• Dynamical magneto-electric coupling in helical magnets
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Electrically driven spin excitation in a ferroelectric magnet DyMnO_3
• Colossal magnon-phonon coupling in multiferroic Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$
• Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals
• Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO${}_3$
• Far-infrared optical excitations in multiferroic TbMnO_3

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• Infrared phonon anomaly and magnetic excitations in single-crystal Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$Cl
• Coupling of lattice, spin and intra-configurational excitations of Eu3+ in Eu2ZnIrO6
• Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3
• Electromagnon and phonon excitations in multiferroic TbMnO3
• Magnons and Magnetodielectric Effects in CoCr${}_2$O${}_4$: Raman Scattering Studies
• Infrared reflectivity of the phonon spectra in multiferroic TbMnO3
• Magnetic order and electromagnon excitations in DyMnO3 studied by neutron scattering experiments
• Molecular-spin dynamics study of electromagnons in multiferroic RMn${}_2$O${}_5$
• Modifying the magnetoelectric coupling in TbMnO${}_3$ by low-level Fe${}^{3+}$ substitution
• Elastic and magnetoelastic properties of TbMnO3 single crystal by nanosecond time resolved acoustics and first-principles calculations