Magnetic and structural properties of Co-Pt perpendicular recording media with large magnetic anisotropy

A Co-Pt film with large magnetic anisotropy at room temperature deposition was studied in terms of magnetic and structural properties. A high Ar gas pressure deposition of the Co-Pt film with a high crystal orientation could realize excellent magnetic properties such as a high perpendicular coercivity and a large magnetic anisotropy. This deposition technique of the Co-Pt film could form physically isolated and magnetically weak coupled grains. Magnetization reversal mechanism of the Co-Pt film deposited at a high Ar gas pressure was revealed to be a rotational mode, while the Co-Pt film deposited at low gas pressure seemed to be a magnetic domain wall motion.