MÖSSBAUER STUDY OF MAGNETIC ORDERING IN AMORPHOUS Fe-Si ALLOYS

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Abstract
Amorphous alloys of composition FexSi100-x (30 ≤ x ≤ 75) have been prepared by the vapour quenching technique. The Mössbauer effect in Fe57 has been used to study the magnetic properties of these materials. The hyperfine field distribution has been determined from these experiments as a function of alloy composition and temperature. The main conclusion is that the hyperfine field in these materials results from a competition between long range and short range effects ; the higher the iron concentration, or the lower the temperature, the more abundant are iron atoms experiencing an hyperfine magnetic field. On the other hand, a model is proposed in which whatever x and T, the hyperfine field is zero for iron atoms having less than between 6 and 7 iron nearest neighbours

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