Magnetic exchange interaction between rare-earth and Mn ions in multiferroic hexagonal manganites

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.

arXiv commentaccepted for publication in Physical Review Letters

References in corpus (5)

• A Field-Induced Re-Entrant Novel Phase and A Ferroelectric-Magnetic Order Coupling in HoMnO3
• Magnetic Order and Spin Dynamics in Ferroelectric HoMnO${}_3$
• Strong spin-lattice coupling in multiferroic HoMnO${}_3$: Thermal expansion anomalies and pressure effect
• Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO${}_3$
• Low temperature dielectric anomalies in HoMnO_3: The complex phase diagram

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