We have studied spin excitations in a single-domain crystal of antiferromagnetic LiCoPO4 by THz absorption spectroscopy. By analyzing the selection rules and comparing the strengths of the absorption peaks in the different antiferromagnetic domains, we found electromagnons and magnetoelectric spin resonances besides conventional magnetic-dipole active spin-wave excitations. Using the sum rule for the magnetoelectric susceptibility we determined the contribution of the spin excitations to all the different off-diagonal elements of the static magnetoelectric susceptibility tensor in zero as well as in finite magnetic fields. We conclude that the magnetoelectric spin resonances are responsible for the static magnetoelectric response of the bulk when the magnetic field is along the x-axis, and the symmetric part of the magnetoelectric tensor with zero diagonal elements dominates over the antisymmetric components.
@article{arxiv.2102.00994,
title = {Magnetoelectric spectroscopy of spin excitations in LiCoPO4},
author = {Vilmos Kocsis and Sándor Bordács and Yusuke Tokunaga and Johan Viirok and Laur Peedu and Toomas Rõõm and Urmas Nagel and Yasujiro Taguchi and Yoshinori Tokura and István Kézsmárki},
journal= {arXiv preprint arXiv:2102.00994},
year = {2021}
}
Comments
Editors' suggestion, Final version, 15 pages with Supplementary, 6 + 3 figures