Spin-wave dispersion and magnon chirality in multiferroic TbMnO3

Abstract

Inelastic neutron scattering experiments combining time-of-flight and polarized techniques yield a comprehensive picture of the magnon dispersion in multiferroic TbMnO3 including the dynamic chirality. Taking into account only Mn3+ moments, spin-wave calculations including nearest-neighbor interactions, frustrating next-nearest neighbor exchange as well as single-ion anisotropy and antisymmetric terms describe the energy dispersion and the distribution of neutron scattering intensity in the multiferroic state very well. Polarized neutron scattering reveals strong dynamic chirality of both signs that may be controlled by external electric fields in the multiferroic phase. Also above the onset of long-range multiferroic order in zero electric field, a small inelastic chiral component can be inverted by an electric field. The microscopic spin-wave calculations fully explain also the dynamic chirality of magnetic excitations, which is imprinted by the static chirality of the multiferroic phase. The ordering of Tb3+ moments at lower temperature reduces the broadening of magnons but also renders the magnon dispersion more complex.

arXiv comment20 pages, 19 figures

References in corpus (46)

• Spin current and magneto-electric effect in non-collinear magnets
• Ferroelectricity in spiral magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3
• Linear spin wave theory for single-Q incommensurate magnetic structures
• Distorted Perovskite with e_g^1 Configuration as a Frustrated Spin System
• Possible evidence for electromagnons in multiferroic manganites
• Dynamical magneto-electric coupling in helical magnets
• Collinear-to-Spiral Spin Transformation without Changing Modulation Wavelength upon Ferroelectric Transition in Tb1-xDyxMnO3
• Spin-Orbit Coupling and Ion Displacements in Multiferroic TbMnO3
• First-principles study of improper ferroelectricity in TbMnO3
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Microscopic Model and Phase Diagrams of the Multiferroic Perovskite Manganites
• Perovskite Manganites Hosting Versatile Multiferroic Phases with Symmetric and Antisymmetric Exchange Strictions
• Neutron diffraction study of TbMnO3: Magnetic structure revisited
• Chirality of Matter Shows Up via Spin Excitations
• Theory of spin-phonon coupling in multiferroic Mn perovskites
• Femtoscale magnetically induced lattice distortions in multiferroic TbMnO3
• Theory of electromagnon in the multiferroic Mn perovskites: Vital role of higher harmonic components of the spiral spin order
• Electric field control of the magnetic chiralities in ferroaxial multiferroic RbFe(MoO4)2
• Relaxations as key to the magnetocapacitive effects in the perovskite manganites
• Biquadratic and ring exchange interactions in orthorhombic perovskite manganites
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Coupling of frustrated Ising spins to magnetic cycloid in multiferroic TbMnO3
• Nature of the magnetic order and origin of induced ferroelectricity in TbMnO${}_3$
• Magnetic field induced flop of cycloidal spin order in multiferroic TbMnO3: The magnetic structure of the P||a phase
• Theory of magnetic switching of ferroelectricity in spiral magnets
• Crystal Field and Dzyaloshinsky-Moriya Interaction in orbitally ordered La_{0.95}Sr_{0.05}MnO_3: An ESR Study
• Multiferroic RMnO3 thin films
• Evidence of electro-active excitation of the spin cycloid in TbMnO3
• Parity Broken Chiral Spin Dynamics in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
• Frustrated classical Heisenberg model in 1 dimension with added nearest-neighbor biquadratic exchange interactions
• New features in the phase diagram of TbMnO${}_3$
• Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO${}_3$
• Field dependence of magnetic correlations through the polarization flop transition in multiferroic TbMnO3 : evidence for a magnetic memory effect
• Magnetic-field-induced switching between ferroelectric phases in orthorhombic-distortion-controlled $R$MnO${}_3$
• Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3
• Chiral spin-wave excitations of the spin-5/2 trimers in the langasite compound Ba3NbFe3Si2O14
• Magnetic order and electromagnon excitations in DyMnO3 studied by neutron scattering experiments
• Spherical neutron polarimetry study of hysteresis in multiferroic MnWO4
• Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling
• Control of multiferroic domains by external electric fields in TbMnO3
• First-principles theory of magnetically induced ferroelectricity in TbMnO3
• Hourglass dispersion in overdoped single-layered manganites
• Magnetic Excitations in the Spin-Spiral State of TbMnO${}_3$ and DyMnO${}_3$
• Persistent and Reversible Phase Control in GdMnO${}_3$ near the Phase Boundary

Cited by in corpus (4)

• Magnetic Signature of Chiral Phonons Revealed by Neutron Spectroscopy in Ferrimagnetic Fe${}_{1.75}$Zn${}_{0.25}$Mo${}_3$O${}_8$
• Multiferroic domain relaxation in (NH4)2[FeCl5(H2O)]
• Spin dynamics in linear magnetoelectric material Mn${}_3$Ta${}_2$O${}_8$
• Chiral Magnons: Mechanisms and Research Progress