Abstract
Structure, magnetic properties and recording characteristics of the CoPtB(O) media with various underlayers were investigated. Recording performance of the CoPtB(O) perpendicular media is closely related to the crystallinity. Magnetic properties and recording characteristics are much improved by the Au seed layer, and higher reproduced output can be obtained at 200 kFRPI. CoPtB(O) perpendicular media show higher resolution than the CoPtB(O)/Cr longitudinal one. The reproduced output of perpendicular media at 200 kFRPI is more than 10 dB higher than that of the longitudinal one. Noise characteristics of both media are quite different in the recording density response. With increasing recording density, the media noise of longitudinal media slightly increases, while that of the perpendicular one gradually decreases. This means for the perpendicular media that the media noise might originate not from the magnetic transition but from the irregular magnetic reversals within recorded bits.
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