Abstract
Multi-layer nanocomposite structures of Ta/Ru/CoCr 1/FeCoTaCr(soft magnetic layer)/CoCr 2/CoCrPt–SiO 2(hard magnetic layer or recording layer)/C and Ta/Ru/CoCr 1/CoCrPt–SiO 2/CoCr 2/FeCoTaCr/C were proposed. This exchange coupled composite (ECC) media consisting of hard/soft stacked magnetic layers were promising in improving the writability of perpendicular magnetic recording media. A small CoCrPt c-axis orientation dispersion of about 3° was achieved with the optimized sputter conditions. The CoCrPt–SiO 2 grains were well segregated by SiO 2 at grain boundaries. The macro-magnetic properties showed that the stacked magnetic grains switched in a coherent mode and that switching field decreased with increasing the thickness of the soft magnetic layer.
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