Long wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3
D. Talbayev, S.A. Trugman, Seongsu Lee, Hee Taek Yi, S.-W. Cheong, and, A. J. Taylor
TL;DR
This study uses terahertz spectroscopy to analyze magnetic and magnetoelectric excitations in BiFeO3, revealing mode splitting due to Dzyaloshinski-Moriya interaction and identifying an electromagnon linked to magnetoelectric coupling.
Contribution
It provides a detailed interpretation of magnetic resonance modes in BiFeO3, highlighting the role of Dzyaloshinski-Moriya interaction and electromagnons in its magnetoelectric behavior.
Findings
Splitting of out-of-plane resonance modes due to Dzyaloshinski-Moriya interaction
Identification of an electromagnon excitation
Correlation between ferroelectric polarization and magnetic structure
Abstract
We present a terahertz spectroscopic study of magnetic excitations in ferroelectric antiferromagnet BiFeO3. We interpret the observed spectrum of long-wavelength magnetic resonance modes in terms of the normal modes of the material's cycloidal antiferromagnetic structure. We find that the modulated Dzyaloshinski-Moriya interaction leads to a splitting of the out-of-plane resonance modes. We also assign one of the observed absorption lines to an electromagnon excitation that results from the magnetoelectric coupling between the ferroelectric polarization and the cycloidal magnetic structure of BiFeO3.
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