Spin wave measurements over the full Brillouin zone of multiferroic BiFeO 3

Jaehong Jeong, E. A. Goremychkin, T. Guidi, K. Nakajima, Gun Sang Jeon, Shin Ae Kim, S. Furukawa, Yong Baek Kim, Seongsu Lee, V. Kiryukhin, S. W. Cheong, Je Geun Park

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Abstract

Using the inelastic neutron scattering technique, we measured the spin wave dispersion over the entire Brillouin zone of room temperature multiferroic BiFeO 3 single crystals with magnetic excitations extending to as high as 72.5meV. The full spin waves can be explained by a simple Heisenberg Hamiltonian with a nearest-neighbor exchange interaction (J=4.38meV), a next-nearest-neighbor exchange interaction (J'=0.15meV), and a Dzyaloshinskii-Moriya-like term (D=0.107meV). This simple Hamiltonian determined, for the first time, for BiFeO 3 provides a fundamental ingredient for understanding the novel magnetic properties of BiFeO 3.

Original languageEnglish
Article number077202
JournalPhysical review letters
Volume108
Issue number7
DOIs
Publication statusPublished - 2012 Feb 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Jeong, J., Goremychkin, E. A., Guidi, T., Nakajima, K., Jeon, G. S., Kim, S. A., Furukawa, S., Kim, Y. B., Lee, S., Kiryukhin, V., Cheong, S. W., & Park, J. G. (2012). Spin wave measurements over the full Brillouin zone of multiferroic BiFeO 3 Physical review letters, 108(7), [077202]. https://doi.org/10.1103/PhysRevLett.108.077202