Neutron scattering study of spin waves in TbFeO 3

Abstract

Iron sublattice spin waves have been studied in TbFeO 3 by inelastic neutron scattering on the PRISMA spectrometer at ISIS. Magnon dispersion curves were measured along [100] and [001] directions up to energies 80 meV and the results fitted to a model taking into account near-neigbour ( J 1) and next-nearest-neigbour ( J 2) isotropic Heisenberg interactions. The exchange parameters J 1 = − 28.7(0.3) K and J 2 = − 1.4(0.5) K obtained for TbFeO 3 agree with those found earlier for another orthoferrite TmFeO 3.