High-Energy Spin-Waves In BCC Iron

The dispersion relation of the spin‐wave excitations in bcc iron has been studied by neutron inelastic scattering at the spallation neutron source ISIS. Magnetic intensity was followed up to 550 meV along the [100] direction. The general form of the dispersion curve is in qualitative agreement with that calculated from a spin‐polarized band model, and in particular the prediction of propagating modes extending above 300 meV has been confirmed.