Abstract
We studied CoPt-ZrO2 granular thin films for their potential application in high-density magnetic recording media. CoPt-ZrO2 granular thin films were fabricated by facing targets sputtering. Co75Pt25-ZrO2 granular thin film (ZrO2 : 48 vol.%, film thickness : 20 nm) had a good square hysteresis loop and a coercivity of 3.5 kOe. The δM plots of films with a ZrO2 content larger than 39 vol.% indicated a decrease in inter-granular coupling, and the magnetic torque curve of the 20 nm thin film showed an average value Ku of 3.0 x 106 erg/cm3. Thus the CoPt-ZrO2 granular films have the potential to be used in high-density recording media.
