Neutron-scattering studies of spin waves in rare-earth orthoferrites

Citations Over TimeTop 24% of 1974 papers

Abstract

Iron sublattice spin waves have been studied in TmFe${\mathrm{O}}_{3}$ and ErFe${\mathrm{O}}_{3}$ by inelastic neutron scattering. In TmFe${\mathrm{O}}_{3}$ magnon dispersion curves were measured along several symmetry directions and the results fitted to an isotropic Heisenberg Hamiltonian with near-neighbor exchange constant ${J}^{\ensuremath{'}}=(\ensuremath{-}1.9\ifmmode\pm\else\textpm\fi{}0.2)$ \ifmmode^\circ\else\textdegree\fi{}K and next-nearest-neighbor exchange $J=(\ensuremath{-}29.1\ifmmode\pm\else\textpm\fi{}0.6)$ \ifmmode^\circ\else\textdegree\fi{}K. A detailed high-resolution study of the long-wavelength spin waves was performed near the moment reorientation transformation. In TmFe${\mathrm{O}}_{3}$, the lowest magnon frequency renormalizes in qualitative agreement with the "soft"-mode theory of the transformation. In ErFe${\mathrm{O}}_{3}$ mode softening was observed only at the lower transformation temperature. Improved estimates are made of the twofold and fourfold anisotropy energies in TmFe${\mathrm{O}}_{3}$.

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