Electromagnon resonance in a collinear spin state of a polar antiferromagnet Fe2Mo3O8
T. Kurumaji, Y. Takahashi, J. Fujioka, R. Masuda, H. Shishikura, S., Ishiwata, and Y. Tokura
TL;DR
This study investigates magnetic excitations in the polar antiferromagnet Fe2Mo3O8, revealing an electromagnon mode active in the collinear antiferromagnetic phase, linked to spin precession and magnetoelectric coupling.
Contribution
It reports the observation and analysis of an electromagnon in Fe2Mo3O8, elucidating its nature and the underlying magnetoelectric mechanism in a collinear spin state.
Findings
Observation of electromagnon in Fe2Mo3O8
Correlation between magnetic transition and mode evolution
Proposed mechanism involving spin precession and electric polarization
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.
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