Abstract
Inelastic neutron scattering measurements have been carried out on Nd 2Fe 14B and Y 2Fe 14B single crystals. Temperature dependent acoustic magnon dispersion curves have been found along the high-symmetry directions [0,0,1] and [1,0,0] with a gap at (0,0,2). Soft mode behaviour at spin wave vector q = 0 was observed for Nd 2Fe 14B near the spin reorientation temperature. The inelastic scattering intensity decreases steeply for larger q. Therefore, the dispersion curves could be measured until the middle of the Brillouin zone only. The experimental results are discussed in the frame of a classical spin wave model.
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