Hyperfine interactions, structure and magnetic properties of nanocrystalline Co-Fe-Ni alloys prepared by mechanical alloying

Mechanical alloying method was used to prepare nanocrystalline Co50Fe40Ni10, Co52Fe26Ni22 and Co65Fe23Ni12 alloys. X-ray diffraction proved that during milling Co–Fe-based solid solution with b.c.c. lattice was formed in the case of Co50Fe40Ni10, while for Co52Fe26Ni22 and Co65Fe23Ni12 compositions Co–Ni-based solid solutions with f.c.c. lattice were obtained. Mossbauer spectroscopy revealed similar values of the average hyperfine magnetic fields for all alloys, e.g. 32.17, 32.24 and 31.21 T for Co50Fe40Ni10, Co52Fe26Ni22 and Co65Fe23Ni12 alloys, respectively. Magnetization measurements allowed to determine the effective magnetic moment, Curie temperature, saturation magnetization and coercive field for the obtained alloys.