title: Spin wave measurements over the full Brillouin zone of multiferroic BiFeO3.
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).
authors.affiliation: FPRD Department of Physics & Astronomy, Center for Strongly Correlated Materials Research, Seoul National University, Seoul, Korea.
authors.forename: Jaehong
authors.initials: J
authors.lastname: Jeong
authors.forename: E A
authors.initials: EA
authors.lastname: Goremychkin
authors.forename: T
authors.initials: T
authors.lastname: Guidi
authors.forename: K
authors.initials: K
authors.lastname: Nakajima
authors.forename: Gun Sang
authors.initials: GS
authors.lastname: Jeon
authors.forename: Shin-Ae
authors.initials: SA
authors.lastname: Kim
authors.forename: S
authors.initials: S
authors.lastname: Furukawa
authors.forename: Yong Baek
authors.initials: YB
authors.lastname: Kim
authors.forename: Seongsu
authors.initials: S
authors.lastname: Lee
authors.forename: V
authors.initials: V
authors.lastname: Kiryukhin
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.forename: Je-Geun
authors.initials: JG
authors.lastname: Park