The dependence of the coercive squareness
S* on the recording characteristics of CoPtCr-SiO
2 perpendicular magnetic recording media was investigated. Experimental results showed that the magnetic cluster size
dcl, which is evaluated by observing the ac-erased magnetization pattern of media, decreased with a decrease in
S*. Ac-erased noise increased with an increase in
S*. At a recording density of 1000 kfci, the S/N of a medium with
S* of 0.39 was 5 dB higher than that of a medium with
S* of 0.44. The recording magnetization pattern was obtained for a medium with
S* of 0.39 at a high recording density of 1300 kfci. Thermal decay of the medium became very small for
S* of less than 0.37. It was concluded that
S* was effective parameter on the recording characteristics of CoPtCr-SiO
2 perpendicular magnetic recording media.
抄録全体を表示