Patent ID: 8512583
Filing Date: 2013-08-20
Classification: C25D,G11B

Abstract:
1. A method for making a mold for making a master disk for use in imprinting magnetic recording disks comprising: forming a pattern of stripes arranged in an annular band on a substrate having a center and a bilayer formed on its surface, wherein the lower layer of said bilayer comprises Cr; forming on the patterned substrate a layer of material comprising a block copolymer, the copolymer material being guided by the stripes to self-assemble into alternating first and second components of the copolymer; removing the second component, leaving the first component; electroplating a metal onto the substrate in the regions between the first component; removing the first component, leaving a pattern of metal; etching the the upper layer of said bilayer using the pattern of metal as a mask, thereby exposing portions of the lower layer; etching the substrate, using portions of the lower layer of said bilayer as a mask; and removing the lower layer of said bilayer, leaving a mold having a pattern of recesses arranged in an annular band.