Abstract
Amorphous alloy of Fe–N with ∼40 at.% N has been prepared by reactive ion-beam sputtering. A systematic study of the growth behaviour, thermal stability, atomic diffusion and the magnetic properties of the alloy has been done. Deposition characteristics of the film have been studied using the x-ray reflectivity and the atomic force microscopy techniques. The results suggest that it is a suitable system for preparing isotopic multilayers for application as the nuclear Bragg monochromator. Pure nuclear Bragg reflections have been observed from an isotopic multilayer of composition: float glass (substrate)/[ nat FeN 0.7 (30 A)/ 57 FeN 0.7 (20 A)] ×10 / nat FeN 0.7 (30 A). A nuclear Bragg peak because of isotopic periodicity is observed at an angle of 0.55°. where the electronic scattering is of the order of 10 -3 . A nuclear reflectivity of 2.5% has been obtained at the first Bragg peak.
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