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Exploring new Co-alloy compositions to achieve both chemical segregation and suitable magnetic properties is a priority task for the development of future perpendicular magnetic recording media. With proper interlayer (IL) design, columnar Co-alloy grains with narrow orientation distribution (Δθ50< 6°) have been obtained on thin ILs (4 nm thick). We demonstrate CoCrPtB-alloys with full remanence squareness and large negative reverse field (Hr<-1.5 kOe) at low IL and magnetic layer thickness of 4 and 11 nm, respectively. It is also shown that carbon overcoat thickness reduction results in a signal-to-noise ratio gain of about 0.5 dB/nm.