Abstract
Neutron scattering measurements of spin waves in the substitutionally ordered alloy Fe 2.68Mn 0.32Si have been performed by the constant-E and constant-Q methods in the temperature range 293–720 K. In the ferromagnetic region the spin wave dispersion relation is quadratic, E=Dq 2, with stiffness constant equal to 160 meV. Å 2 at room temperature. Magnon-like peaks observed above T c in constant-E scans were not detected in constant-Q scans leading us to the conclusion that they originated from paramagnetic scattering.
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