Electromagnon Resonances in the Optical Response of Spiral Magnets

Abstract

The optical response of spiral magnets is studied, with special attention to its electromagnon features. We show that these features trace back to the resonant magnetoelectric response resulting from the spiral ordering (irrespective of any concomitant ferroelectricity). This response, being magnetoelectric in nature, not always can be reduced to an effective electric permittivity. We argue that electromagnons in spiral magnets can produce, in addition to the observed peaks in the optical absorption of multiferroics, a (dynamically enhanced) optical rotation and a negative refractive index behavior.

5 pages

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Cited by in corpus (10)

• Four-coloured Spin-wave Excitations in Multiferroic Materials
• Nonreciprocal Directional Dichroism and Toroidalmagnons in Helical Magnets
• Electric field control of terahertz polarization in a multiferroic manganite with electromagnons
• Magneto-electric excitations in multiferroic TbMnO3 by Raman scattering
• Electric field control of magnon-induced magnetization dynamics in multiferroics
• THz Magneto-electric atomic rotations in the chiral compound Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
• Magneto- to electro-active transmutation of spin waves in ErMnO3
• Magnetic order and electromagnon excitations in DyMnO3 studied by neutron scattering experiments
• Electromagnons in the multiferroic state of perovskite manganites with symmetric-exchange striction
• Terahertz magnetoelectric response via electromagnons in magnetic oxides