Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin

Abstract

We summarize the existing experimental data on electromagnons in multiferroic RMn2O5 compounds, where R denotes a rare earth ion, Y or Bi, and discuss a realistic microscopic model of these materials based on assumption that the microscopic mechanism of magnetically-induced ferroelectricity and electromagnon absorption relies entirely on the isotropic Heisenberg exchange and magnetostrictive coupling of spins to a polar lattice mode and does not involve relativistic effects. This model explains many magnetic and optical properties of RMn2O5 manganites, such as the spin re-orientation transition, magnetically-induced polarisation, appearance of the electromagnon peak in the non-collinear spin state and the polarisation of light for which this peak is observed. We compare experimental and theoretical results on electromagnons in RMn2O5 and RMnO3 compounds.

20 pages, 9 figures, to be published in J. Phys.: Condens. Matter, special issue on multiferroics

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Cited by in corpus (39)

• Electrodynamics of Correlated Electron Materials
• Dynamical Multiferroicity
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Four-coloured Spin-wave Excitations in Multiferroic Materials
• Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals
• General method for atomistic spin-lattice dynamics with first principles accuracy
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Multiferroic and magnetoelectric nature of GaFeO3, AlFeO3 and related oxides
• Evidence of electro-active excitation of the spin cycloid in TbMnO3
• Electromagnons in the spin collinear state of a triangular lattice antiferromagnet
• Electric field control of terahertz polarization in a multiferroic manganite with electromagnons
• Spin-driven Phase Transitions in ZnCr${}_2$Se${}_4$ and ZnCr${}_2$S${}_4$ Probed by High Resolution Synchrotron X-ray and Neutron Powder Diffraction
• Magneto-electric excitations in multiferroic TbMnO3 by Raman scattering
• Electromagnon dispersion probed by inelastic x-ray scattering
• Electromagnon resonance in a collinear spin state of a polar antiferromagnet Fe2Mo3O8
• Microscopic Theory for Coupled Atomistic Magnetization and Lattice Dynamics
• Critical slowing down near the multiferroic phase transition in MnWO${}_4$
• Magnetic excitations in the low-temperature ferroelectric phase of multiferroic YMn2O5 using inelastic neutron scattering
• Giant gigahertz optical activity in multiferroic ferroborate
• Induced ferroelectric phases in TbMn_2O_5
• Directional magnetoelectric effects in MnWO4: magnetic sources of the electric polarization
• A table-top, repetitive pulsed magnet for nonlinear and ultrafast spectroscopy in high magnetic fields up to 30 T
• Giant directional birefringence in multiferroic ferroborate
• Magnons and Magnetodielectric Effects in CoCr${}_2$O${}_4$: Raman Scattering Studies
• Possible coupling between magnons and phonons in multiferroic CaMn7O12
• Soft-mode behavior of electromagnons in multiferroic manganite
• Electromagnon Resonances in the Optical Response of Spiral Magnets
• Collinear order and chirality-reorientation transition in the Cairo pentagonal magnet Bi${}_4$Fe${}_5$O${}_{13}$F
• Terahertz dielectric response and coupled dynamics of ferroelectrics and multiferroics from effective Hamiltonian simulations
• Infrared phonons as a probe of a spin-liquid states in herbertsmithite ZnCu3(OH)6Cl2
• Reversing ferroelectric polarization in multiferroic DyMn2O5 by nonmagnetic Al substitution of Mn
• High-Frequency Electromagnon in GdMnO3
• Terahertz Spin-Orbital Excitations in the paramagnetic state of multiferroic Sr${}_2$FeSi${}_2$O${}_7$
• Electromagnon in ferrimagnetic eps-Fe2O3 nanograin ceramics
• Spectral origin of the colossal magnetodielectric effect in multiferroic DyMn2O5
• Molecular-spin dynamics study of electromagnons in multiferroic RMn${}_2$O${}_5$
• Theory of magnetic field-induced metaelectric critical end point in BiMn${}_2$O${}_5$
• The effect of transverse magnetic correlations on a coupled order parameter: shifted transition temperatures and thermal hysteresis
• Tracking a hysteretic and disorder-broadened phase transition via the electromagnon response in improper ferroelectrics