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.

arXiv comment5 Pages, 4 figures

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Cited by in corpus (29)

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• Dynamical Multiferroicity
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• Magnetization Dynamics of Nanoscale Magnetic Materials: A Perspective
• Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites
• Infrared phonon anomaly and magnetic excitations in single-crystal Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$Cl
• Evidence of electro-active excitation of the spin cycloid in TbMnO3
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• Quasiclassical theory for antiferromagnetic metals
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• Spin-Wave and Electromagnon Dispersions in Multiferroic MnWO4 as Observed by Neutron Spectroscopy: Isotropic Heisenberg Exchange versus Anisotropic Dzyaloshinskii-Moriya Interaction
• Temperature-Dependent Infrared Reflectivity Studies of Multiferroic TbMnO_{3}: Evidence for Spin-Phonon Coupling
• Exceptional field dependence of antiferromagnetic magnons in LiFePO${}_4$
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• Magneto-Plasmonics and Resonant Interaction of Light with Dynamic Magnetisation in Metallic and All-Dielectric Nanostructures (Review)