MAGNETIC HYPERFINE FIELD DISTRIBUTIONS IN FE73.5CU1NB3SI13.5B9

The ribbons of amorphous alloy of Fe73.5Cu1Nb3Si13.5B9 were isothermal ly annealed at the temperature 545-degrees-C in the range from 20 minu tes up to 120 minutes. Three samples or different thicknesses of 33 mu m, 27 mum and 21 mum were used. rhe obtained nanocrystals were studied by Mossbauer spectroscopy. The amount or remaining amorphous phase an d average hyperfine field have been dependent on annealing time. Both these parameters have been decreased more rapidly for a thicker sample than for the thinner one. In P(H) distribution we observed a growing low field component and a vanishing high field component. The reason f or such a different crystallization processes in various samples is th e inhomogeneously distributed silicon along the ribbon thickness.