Magnetic hyperfine temperature dependence in Fe–Si crystalline alloys
Résumé
Abstract Fe–Si crystalline alloys with different silicon contents (4.5, 12, 18 and 26 at.%) were investigated by 57Fe Mössbauer spectrometry and a.c. magnetic measurements in order to get magnetic hyperfine data as a function of temperature and Curie temperatures as a function of silicon content at the different iron sites. The values of critical exponent β which are independent on the iron site are found close to 0.36, typical of Heisenberg ferromagnets, whatever the silicon content. The present results support the assumptions made in the literature to describe the magnetic and hyperfine properties of FINEMET nanocrystalline alloys and can further be considered.