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

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

2008-11-06

arxiv.org/abs/0811.0999v1

Physics

Condensed Matter

Materials Science

accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.247601

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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