Spin wave measurements over the full Brillouin zone of multiferroic BiFeO3

Details Spin wave measurements over the full Brillouin zone of multiferroic BiFeO3 Spin wave measurements over the full Brillouin zone of multiferroic BiFeO3

2012-01-02

arxiv.org/abs/1201.0436v2

Phys. Rev. Lett. 108, 077202 (2012)

Physics

Condensed Matter

Materials Science

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.108.077202

Using inelastic neutron scattering technique, we measured the spin wave dispersion over the entire Brillouin zone of room temperature multiferroic BiFeO3 single crystals with magnetic excitations extending to as high as 72.5 meV. The full spin waves can be explained by a simple Heisenberg Hamiltonian with a nearest neighbor exchange interaction (J=4.38 meV), a next nearest neighbor exchange interaction (J'=0.15 meV), and a Dzyaloshinskii-Moriya-like term (D=0.107 meV). This simple Hamiltonian determined, for the first time, for BiFeO3 provides a fundamental ingredient for understanding of the novel magnetic properties of BiFeO3.

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