In this paper, a review of recent 57Fe Mössbauer spectroscopy (MS) studies of external
influence on the properties of amorphous and nanocrystalline Fe- and Co-based alloys is submitted.
Different types of alloys (FeCuNbZr, FeCuNbSiB, FeCoCuNbB, CoFeZrB and CoFeSiB) in the
form of original amorphous and nanocrystalline ribbons were subjected to different external factors:
different annealing atmospheres, mechanical stress (for example influence of ball-milling) and
tensile stress. It will be shown that the Mössbauer spectrometry is a suitable tool for such studies
because the measured spectral parameters are very sensitive to the changes in the vicinity of the
probe 57Fe-nuclei and thus, this technique provides a wide variety of information about structural
and magnetic behavior of Fe-containing materials.