SPIN WAVE DISPERSION RELATION IN ORDERED Fe3Al

1 February 1971

journal article
Published by EDP Sciences in Le Journal de Physique Colloques

Vol. 32 (C1) , C1-1188
https://doi.org/10.1051/jphyscol:19711426

Abstract

The dispersion relation of acoustical spin waves in ordered Fe3Al has been determined bu inelastic scattering of polarized neutrons. Measurements have been performed for values of magnon wavevectors q up to 0.33 Å-1 and the experimental points were fitted with a dispersion law of polynomial type. The best fit was found for the law ħ ω = Dq2(1 - βq2) with D = (83 ± 4) meV.Å2 and β = (0.1 ± 0.6)A2. The sharp decrease of the stiffness constant as compared with the one of pure Fe, can not be completely explained by simple dilution and suggests that the variation of the exchange interaction in the ordered phase should play an appreciable role. On the other hand the almost quadratic dispersion law suggests that the nearest neighbours interaction is predominant

Keywords

This publication has 0 references indexed in Scilit: