Characterization of Perpendicular Recording Media of CoPtCrO Granular Thin Films

概要

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Thermal stability of CoPtCrO granular thin films with perpendicular magnetic anisotropy is investigated.Magnetization decay with time M(t) exhibits almost a linear dependence with In(t), similar to that for longitudinal recording media.In comparison with amorphous rare earth-transition metal alloys media which shows a non-linear decay with In(t), the differences in magnetization reversal process and energy barrier distribution are discussed.From magnetic viscosity measurements, activation volume is determined and shows a minimum of about 2x10~-18cm~3 for CoPtCrO at fields near its coercivity, leading to a coupled region of 10 nm average diameter.Also recording performance is investigated using a conventional merged GMR head and magnetic force microscope.The linear recording density dependence of signal amplitude reveals that the 50% rolloff density D_50 is about 300 kfci.
社団法人日本磁気学会の論文
2001-03-15