Temperature-dependent interplay of dzyaloshinskii-moriya interaction and single-ion anisotropy in multiferroic BiFeO3

Jaehong Jeong, Manh Duc Le, P. Bourges, S. Petit, S. Furukawa, Shin Ae Kim, Seongsu Lee, S. W. Cheong, Je Geun Park

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Low-energy magnon excitations in multiferroic BiFeO3 were measured in detail as a function of temperature around several Brillouin zone centers by inelastic neutron scattering experiments on single crystals. Unique features around 1 meV are directly associated with the interplay of the Dzyaloshinskii-Moriya interaction and a small single-ion anisotropy. The temperature dependence of these and the exchange interactions were determined by fitting the measured magnon dispersion with spin-wave calculations. The spectra best fit an easy-axis type magnetic anisotropy and the deduced exchange and anisotropy parameters enable us to determine the anharmonicity of the magnetic cycloid. We then draw a direct connection between the changes in the parameters of spin Hamiltonian with temperature and the physical properties and structural deformations of BiFeO3.

Original languageEnglish
Article number107202
JournalPhysical review letters
Volume113
Issue number10
DOIs
Publication statusPublished - 2014 Sep 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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