Fe-Cu films with various contents of Cu were prepared by using the RF sputtering method, followed by an annealing treatment in vacuum at different temperatures for 2 min. X-ray diffraction analysis was made to identify the structural change of the films after annealing. It was found that, when the Cu content was no more than 50 at%, the coercivity decreased after annealing at 523 K, owing to the reduction of internal stress induced during the sputtering process. The coercivity, however, increased after annealing at 773 K, caused by the precipitation of Cu from the metastable BCC-Fe(Cu) solid solution. Furthermore, the increase of Cu content in the BCC-Fe decreased the temperatures at which the coercivity began to increase. The effects of increased annealing temperatures caused a decrease in lattice parameter of BCC-Fe accompanied by a slight decrease in saturation magnetization Ms for all Cu concentrations.
- Magnetic properties
- Thin films
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics