title: 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. The 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.
authors.affiliation: Center for Integrated Nanotechnologies, MS K771, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. diyar@lanl.gov
authors.forename: D
authors.initials: D
authors.lastname: Talbayev
authors.forename: A D
authors.initials: AD
authors.lastname: LaForge
authors.forename: S A
authors.initials: SA
authors.lastname: Trugman
authors.forename: N
authors.initials: N
authors.lastname: Hur
authors.forename: A J
authors.initials: AJ
authors.lastname: Taylor
authors.forename: R D
authors.initials: RD
authors.lastname: Averitt
authors.forename: D N
authors.initials: DN
authors.lastname: Basov