Influence of controlled Co addition on structural and magnetic properties of (Fe100-x Cox)78Si9Nb3B 9Cu1 (x 0, 20, 40, 60) alloys has been studied using DTA, XRD, magnetic measurements and Mössbauer spectroscopy. Results show that the variation of Co content affects the stability of the alloy against crystallization. Volume fraction of the nanograins varies only slightly and remains around 60 %. The corresponding grain diameter ranges between 13 to 15 nm. Obtained lattice parameter values suggest that the studied nanocrystalline samples consist of bcc Co-Fe phase with Si impurities, with Co content ranging between 38 to 61 % and Si content ranging between 7 to 15 %. Coercive field for as-cast specimens practically does not change with increase of Co content whereas for annealed samples it exhibits appreciable increases. Mössbauer measurements show that with increase of Co content, there is a change in: the environment around Fe-atom; spin texture and disorder in the studied specimens.
ASJC Scopus subject areas
- Physics and Astronomy(all)