A block copolymer-directed self-assembly was combined with nanoimprint lithography to generate templates with rectangular patterns through an original double imprint process. A rotary e-beam tool was used to separately expose circumferential and radial line/space chemical contrast patterns with periodicities commensurate to the natural period of two lamellae-forming poly(styrene-b-methyl methacrylate) (PS-b-PMMA) block copolymers. Line patterns are formed by directed self-assembly of PS-b-PMMA on chemical patterns on two separate submaster templates, one with circumferential lines to define concentric tracks, and a second template on which the block copolymer is used to form radial lines at constant angular pitch. The patterns are subsequently transferred to their underlying Si substrates to form submaster templates. Using two sequential nanoimprinting steps, the radial and circumferential submaster line patterns were combined into a final quartz master template with rectangular bits on circular tracks.
We combine block copolymer directed self-assembly with nanoimprint lithography to generate templates with rectangular patterns through an original double imprint process. We use a rotary e-beam tool to separately expose circumferential and radial line/space chemical contrast patterns with periodicities commensurate to the natural period of two lamellae-forming poly(styrene-b-methyl methacrylate) (PS-b-PMMA) block copolymers. Line patterns are formed by
directed self-assembly of PS-b-PMMA on chemical patterns on two separate submaster templates, one with circumferential lines to define concentric tracks, and a second template on which the block
copolymer is used to form radial lines at constant angular pitch. The patterns are subsequently transferred to their underlying Si substrates to form submaster templates. Using two sequential
nanoimprinting steps, we combine the radial and circumferential submaster line patterns into a final quartz master template with rectangular bits on circular tracks.
Bit patterned media (BPM) for magnetic recording has emerged as a promising technology to deliver thermally stable
magnetic storage at densities beyond 1Tb/in2. Insertion of BPM into hard disk drives will require the introduction of
nanoimprint lithography and other nanofabrication processes for the first time. In this work, we focus on nanoimprint
and nanofabrication challenges that are being overcome in order to produce patterned media.
Patterned media has created the need for new tools and processes, such as an advanced rotary e-beam lithography tool
and block copolymer integration. The integration of block copolymer is through the use of a chemical contrast pattern on
the substrate which guides the alignment of di-block copolymers.
Most of the work on directed self assembly for patterned media applications has, until recently, concentrated on the
formation of circular dot patterns in a hexagonal close packed lattice. However, interactions between the read head and
media favor a bit aspect ratio (BAR) greater than one. This design constraint has motivated new approaches for using
self-assembly to create suitable high-BAR master patterns and has implications for template fabrication.
Conference Committee Involvement (2)
Nanoengineering: Fabrication, Properties, Optics, and Devices VII
3 August 2010 | San Diego, California, United States
Nanoengineering: Fabrication, Properties, Optics, and Devices VI
4 August 2009 | San Diego, California, United States
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