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A high signal-to-noise ratio (S/N) was achieved by increasing the Cr content of CoCr and CoCrPt perpendicular media. When the Cr content was increased from 22 at.% to 28 at.%, the S/N increased by 6 dB at 70 kFCI. Addition of 6 at.% Pt to the Co72Cr28 medium yielded a 2 dB higher S/N than that of a longitudinal medium. The medium noise was analyzed by using the parameters Ms, δM⊥, and medium thickness. The medium noise of both CoCr and CoCrPt media increase with the Ms value increase. The existence of an anti-magnetized area in the dc-erased track may affect the increase in the noise of the perpendicular media. There are two types of medium thickness dependence of the S/N. The Cr-rich CoCr medium, whose S/N is maximized at a large medium thickness, is expected to be used for recording densities of over 10 Gbits/in2.

High Signal-to-Noise Ratio of Cr-Rich CoCr and CoCrPt Perpendicular Media