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Magnetic excitations are investigated for a hexagonal polar magnet Fe2Mo3O8by terahertz spectroscopy. We observed magnon modes including an electric-fieldactive magnon, electromagnon, in the collinear antiferromagnetic phase withspins parallel to the c axis. We unravel the nature of these excitations byinvestigating the correlation between the evolution of the mode profile and themagnetic transition from antiferromagnetic to ferrimagnetic order induced bymagnetic field or Zn-doping. We propose that the observed electromagnon modeinvolves the collective precession of the spins with oscillating in-planeelectric polarization through the mechanism of the linear magnetoelectriceffect.

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