Iron-based nanocrystalline alloys investigated by Fe-57 Mossbauer spectrometry

Soft magnetic nanocrystalline alloys have attracted great fundamental inter est in recent years due to their two-phase structural and magnetic behaviou r. We review first the reliability of the fitting procedures of spectra obt ained by Fe-57 Mossbauer spectrometry which is a very efficient tool to inv estigate such materials. Then, we report the common features which characte rise the temperature dependence of Mossbauer spectra; the hyperfine field t emperature dependence of both the crystalline grains and the intergranular phase is discussed for different crystalline fractions in order to model th e magnetic behaviour of the nanocrystalline alloys.