Ordering and orientation of CoPt/SiO2 granular films with additive Ag

Abstract

We have studied the chemical ordering of granular films $(\mathrm{CoPt}{)}_{\text{1−x}}{\mathrm{Ag}}_x/{\mathrm{SiO}}_{\mathrm{2}}$ with the concentration $\text{x=2–6\hspace{0.05em}}\mathrm{at.}\mathrm{ \%.}$ It was found that the additive Ag efficiently promotes the ordering process, reducing the ordering temperature by 100 °C compared with that of without Ag. The additive Ag also stimulates nearly perfect (001) orientation of the CoPt-ordered grains in the films with a thickness of less than 50 nm, resulting in a large perpendicular magnetic anisotropy.