Magnetic exchange interaction between rare-earth and Mn ions in multiferroic hexagonal manganites
D. Talbayev, A. D. LaForge, S. A. Trugman, N. Hur, A. J. Taylor, R. D., Averitt, D. N. Basov
TL;DR
This study investigates the magnetic interactions in HoMnO3, revealing how rare-earth Ho ions and Mn ions interact magnetically through spectroscopy, and provides a model for these interactions.
Contribution
It presents the first detailed analysis of magnetic exchange interactions between rare-earth and Mn ions in hexagonal manganites using infrared spectroscopy.
Findings
Identified magnetic-dipole transitions of Ho ions.
Measured magnetic exchange coupling between Ho and Mn ions.
Determined the effective spin Hamiltonian for Ho ions.
Abstract
We report a study of magnetic dynamics in multiferroic hexagonal manganite HoMnO3 by far-infrared spectroscopy. Low-temperature magnetic excitation spectrum of HoMnO3 consists of magnetic-dipole transitions of Ho ions within the crystal-field split J=8 manifold and of the triangular antiferromagnetic resonance of Mn ions. We determine the effective spin Hamiltonian for the Ho ion ground state. The magnetic-field splitting of the Mn antiferromagnetic resonance allows us to measure the magnetic exchange coupling between the rare-earth and Mn ions.
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