Abstract
A granular-type medium with a highly oriented high-Bs Fe-Co soft underlayer (SUL) and a thin Ru intermediate layer of 4 nm was prepared. It displayed low Hch (Hc in the hard axis direction) value of 1.1 Oe in the SUL and high Hc of 6.0 kOe in a Co-Pt-TiO2 recording layer. The recording layer in the medium has a novel granular structure, namely, well-isolated clusters composed of 5-15 pieces of small Co-Pt grains 4-7 nm in diameter segregated by TiO2. The clusters were oval, with an average area of 213 nm2. At present, the shape and arrangement of the clusters cannot be controlled successfully.
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