In-plane Structure Control of CoPt-TiO2 Recording Layer by Using Nanoparticle-like Ta Orientation Control Layer

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  • Shintaku K.
    Akita Research Institute of Advanced Technology, Akita Research and Development Center

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A novel method of controlling the grain structure in perpendicular recording media was presented, by which medium noise was reduced and S/N was increased. CoPt-TiO2 granular-type media with an extremely thin Ru intermediate layer were prepared on a highly oriented high-Bs FeCo soft underlayer and a Ta orientation control layer (OCL). A nanoparticle-like structure was formed on the Ta surfaces by changing the sputtering conditions and the film thicknesses of Ta OCL. Lower Ar gas pressure and thinner film thickness brought about a smooth and fine Ta OCL surface. A peculiar granular structure for the recording layer, namely, an isolated cluster-like structure composed of 5 to 10 CoPt grains 4—7 nm in diameter segregated by TiO2, was observed for the medium on the smaller nanoparticle-like Ta OCL. The smaller nanoparticle-like Ta OCL improved the magnetic and structural properties of the recording layer. The noise for the medium on the smaller nanoparticle-like Ta OCL greatly decreased at all recording densities. As a result, the S/N for the medium on the smaller nanoparticle-like Ta OCL increased at all recording densities compared with that on the larger nanoparticle-like Ta OCL.

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