Granular $\hbox{Co}_{3}\hbox{Pt}$ Thin Films With Perpendicular Hard Magnetic Properties for Perpendicular Magnetic Recording Media

The granular hcp Co
₃
Pt nano-grains with large perpendicular coercivity (Hc
_perp
) of 3800 Oe and high perpendicular squareness (S
_perp
) of 0.93 can be achieved by deposited 14 nm thickness of Co
₃
Pt magnetic layer onto the Pt underlayer with thickness of 200 nm and annealing at low temperature of 300degC in a vacuum of 1 mTorr. It is found that the oxygen atoms would diffuse into Co
₃
Pt layer through inter-grains to isolate Co
₃
Pt grains and prevent grain growth that will decrease inter-grains interaction and enhance recording density of the magnetic film. This film revealed its prominent potential to be applied as perpendicular magnetic recording media for ultra high-density recording.