Abstract
The small-angle polarized neutron scattering technique has been employed to study the spin dynamics in both as-quenched and annealed samples of amorphous Fe 40Ni 40B 20. The spin wave stiffness coefficient, D, the spin wave damping parameter γ 0 and the density of the magnetic dipolar interaction energy ω 0 have been obtained from a least-squares fit of the theoretical spin wave contribution to the measured intensities. The effect of annealing is most clearly manifested in D, which increases monotonically with annealing time. An atomic model is used to quantify the relation between D and the chemical order of the metal atoms.
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