Structural and magnetic properties of mechanically alloyed Fe50Co50 nanoparticles

摘要

Fe50Co50 nanoparticles were prepared by mechanical alloying method in air and subsequently annealing at various temperatures (773 K, 873 K, and 973 K). X-ray diffraction and selective area electron diffraction measurements on the powder sample milled for 10 h showed the Fe50Co50 coexisting with a minor secondary phase of Fe3O4. It was found that the Fe3O4 phase decreased gradually with increasing annealing temperature and disappeared at 973 K. Moreover, the saturation magnetization of annealed samples was found not only depend on the annealing temperature but also the milling time. Finally, we showed that the temperature dependence of the saturation magnetization of sample after annealing at 973 K could be well descried by the Bloch's law. (C) 2015 Elsevier B.V. All rights reserved.