Spin wave measurements over the full Brillouin zone of multiferroic BiFeO3 |
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Authors: | Jeong Jaehong Goremychkin E A Guidi T Nakajima K Jeon Gun Sang Kim Shin-Ae Furukawa S Kim Yong Baek Lee Seongsu Kiryukhin V Cheong S-W Park Je-Geun |
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Institution: | FPRD Department of Physics & Astronomy, Center for Strongly Correlated Materials Research, Seoul National University, Seoul, Korea. |
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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 72.5 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 BiFeO(3) provides a fundamental ingredient for understanding the novel magnetic properties of BiFeO(3). |
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