Abstract
We have carried out a study of the low-temperature magnetization and spin-wave dispersion in the amorphous metallic ferromagnet Fe 78B 13Si 9. The temperature dependence of the magnetization was measured with a vibrating sample magnetometer and the spin-wave measurements were carried out using inelastic neutron scattering techniques. The magnetization is found to obey the usual law if M s(T) = M s(0)(1 − BT 3 2 − CT 5 2 …) , while the spin waves follow the conventional ferromagnetic dispersion relation E q = D( T) q 2 + Δ + …. The spin wave stiffness constant D( T) is found to be substantially larger than the value inferred from the magnetization data, similar to the behavior observed in other Invar-type materials.
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