Effects of very thin carbon layer on formation of hcp phase for CoCrPtB perpendicular media with Co/sub 60/Cr/sub 40/ intermediate layer

Summary form only given. For CoCr based perpendicular media, many trials have been reported to reduce the initial growth region in magnetic layer by using epitaxial growth technique with a Cr-rich CoCr intermediate layer. Recently it has been reported that CoCr intermediate layer with very thin carbon layer with a thickness less than 1 nm is significantly effective to improve perpendicular magnetic properties for CoCr-based perpendicular recording media. However, the role of very thin carbon layer for the microstructure of the film has not been clarified yet. In this paper, we present the mechanism of film growth of CoCr intermediate layer and CoCrPtB magnetic layer by analyzing the thickness dependence of in-plane XRD profiles and the perpendicular magnetic anisotropy. The media used in the analysis was Co/sub 69/Cr/sub 19/Pt/sub 8/B/sub 4//Co/sub 60/Cr/sub 40//C(1nm)/Ti(25nm) media (d/sub mag/=30nm, H/sub c/=3.5kOe, and S=0.89), compared with the media without C layer.