A new type of composite target is proposed for low Ar-gas-pressure (PAr) deposition of CoPtCr-SiO2granular perpendicular magnetic recording media. The proposed target is a Co-Pt-Cr-CoSi-enriched CoO sintered target, consisting of CoSi and CoO powders instead of SiO2powder. Systematic analysis of film composition, microstructure, and magnetic properties of the granular films revealed that 1) the Co74Pt16Cr10-8mol%SiO2granular film with O/Si ratio of 2 in the film is realized by using a CoO/CoSi ratio of 3 in the target for our sputtering system, and 2) media with S=1, Hc=5.0 kOe, and α = 2.9 was realized even under a low PArof 0.6 Pa. This means that just the oxidization of Si into SiO2is important for magnetic decoupling.
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Sasaki et al. (2013) studied this question.
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