Patent ID: 8501022

Claim:
A method using a block copolymer (BCP) for making a master disk for use in imprinting magnetic recording disks comprising: providing a substrate; depositing on the substrate a polymeric neutral layer; patterning the neutral layer into a pattern of stripes and gap regions, the stripes being generally equally spaced and having a stripe pitch of approximately nL 0 , where n is an integer equal to or greater than 2 and L 0 is the bulk period of the BCP, and the gap regions having a gap width greater than 2L 0 ; forming on the patterned neutral layer a BCP having a bulk period L 0 , the BCP material being guided by the stripes to self-assemble into alternating first and second components of the BCP arranged as lamellae perpendicular to the substrate, the BCP self-assembling in the gap regions as alternating first and second components of the BCP arranged as lamellae parallel to the substrate; and removing the second component, leaving the first component on the substrate.