Magnetic and magnetoelectric excitations in TbMnO${}_3$

Abstract

Magnetic and magnetoelectric excitations in the multiferroic TbMnO_3 have been investigated at terahertz frequencies. Using different experimental geometries we can clearly separate the electro-active excitations (electromagnons) from the magneto-active modes, i.e. antiferromagnetic resonances (AFMR). Two AFMR resonances were found to coincide with electromagnons. This indicates that both excitations belong to the same mode and the electromagnons can be excited by magnetic ac-field as well. In external magnetic fields and at low temperatures distinct fine structure of the electromagnons appears. In spite of the 90^o rotation of the magnetic structure, the electromagnons are observable for electric ac-fields parallel to the a-axis only. Contrary to simple expectations, the response along the c-axis remains purely magnetic in nature.

5 Pages, 4 figures

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• Superconducting proximity effect and long-ranged triplets in dirty metallic antiferromagnets
• Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3
• Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO${}_3$
• 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
• Quasiclassical theory for antiferromagnetic metals
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• Modifying the magnetoelectric coupling in TbMnO${}_3$ by low-level Fe${}^{3+}$ substitution
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