Abstract
The use of a non-destructive nuclear-physical method, namely 57Fe Mossbauer spectroscopy, is discussed for the investigation of magnetic and structural arrangement of Fe-based nanocrystalline alloys. Transmission Mossbauer spectroscopy (TMS) as well as conversion electron Mossbauer spectroscopy (CEMS) are reviewed using FINEMET- and NANOPERM-type nanocrystalline alloys as examples. They consist of nanocrystalline grains embedded within a residual amorphous matrix thus exhibiting a two-phase magnetic behaviour. Hyperfine field distributions derived from Mossbauer spectra provide information about the structure and magnetic states of atoms located in different structural positions. Prior to this, basic features of Mossbauer spectra are briefly summarised. Influence of composition, content of nanograms, and interactions among them are demonstrated as a function of annealing temperature and measuring temperature for bulk (TMS) and surface (CEMS) of the investigated nanocrystalline alloys.
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