Electromagnon resonance in a collinear spin state of a polar antiferromagnet Fe2Mo3O8

Abstract

Magnetic excitations are investigated for a hexagonal polar magnet Fe2Mo3O8 by terahertz spectroscopy. We observed magnon modes including an electric-field active magnon, electromagnon, in the collinear antiferromagnetic phase with spins parallel to the c axis. We unravel the nature of these excitations by investigating the correlation between the evolution of the mode profile and the magnetic transition from antiferromagnetic to ferrimagnetic order induced by magnetic field or Zn-doping. We propose that the observed electromagnon mode involves the collective precession of the spins with oscillating in-plane electric polarization through the mechanism of the linear magnetoelectric effect.

16 pages, 4 figures

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Cited by in corpus (9)

• Direct observation of topological magnon polarons in a multiferroic material
• Colossal linear magnetoelectricity in polar magnet Fe2Mo3O8
• Magnetization reversal through an antiferromagnetic state
• Ordering of Fe and Zn ions and magnetic properties of FeZnMo3O8
• Magnetic anisotropy and exchange paths for octa- and tetrahedrally coordinated Mn${}^{2+}$ ions in the honeycomb multiferroic Mn${}_2$Mo${}_3$O${}_8$
• Nonlinear spin current of photoexcited magnons in collinear antiferromagnets
• Optical magnetoelectric effect in the polar honeycomb antiferromagnet Fe2Mo3O8
• Magnetic Interactions in the Polar Ferrimagnet with a Bipartite Structure
• Optical phonons as a testing ground for spin group symmetries