Neutron-Scattering Determination of Spin-Wave Dispersion Relations in FeF2
- 1 February 1968
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 39 (2), 1120-1121
- https://doi.org/10.1063/1.1656191
Abstract
Spin‐wave dispersion in antiferromagnetic FeF2 has been investigated by inelastic neutron scattering at 4.2°K. Incident neutrons of 122 cm−1 energy were used to excite spin waves in a {010} plane, and the energies of the scattered neutrons determined by time‐of‐flight techniques. The single mode observed has a rather flat dispersion lying between 53 and 79 cm−1. The measured energies were fitted to a theoretical expression to determine values for the single ion anisotropy constant D, , and the exchange interactions between the ions Jl, . We find D = 6.46(+0.29, −0.10) cm−1, J1 (coupling neighboring ions along the c axis) = −0.048 (±0.060) cm−1, J2 (coupling neighboring ions at the corner and body center of the cell) = +3.64(±0.10) cm−1, and J3 (coupling neighboring ions along the a axis) = +0.194(±0.060) cm−1.
Keywords
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