Duplicated templates from a patterned silicon master were studied. The pattern was fabricated on a silicon wafer by
rotary electron beam (EB) writer and reactive ion etching (RIE). 2.5-inch full surface discrete track media (DTM)
templates of TP70nm supporting skewed servo patterns and discrete tracks were fabricated. The pattern on the silicon
master was successfully transferred to quartz templates by UV nanoimprint lithography (NIL) and RIE using a specially
prepared UV-NIL resist. TP60nm pattern fabrication was also accomplished by this same hard mask-less method. Servo
pattern printing (SPP) was used to investigate the repeatable run-out (RRO) of servo patterns. Nickel molds and quartz
templates were duplicated from the same silicon master by their respective processes and their RROs compared. It was
found that the duplication process (quartz or nickel) influenced the RRO profile and that the quartz NIL process did not
significantly degrade RRO.
The Nano Imprint Lithography (NIL) process has been proposed as a method of making Discrete Track Media (DTM)
for the next generation hard disc. The UV-NIL process is especially practical because of its minimal thermal expansion
and high manufacturing throughput. Quartz template fabrication is a key issue in UV-NIL. Duplication from a Si master
using NIL was studied as a method of such quartz template fabrication. In this method, the UV light radiated through
the quartz substrate to reach the resist. This method avoids typically used Cr (and other hard masks) on the quartz
substrate, eliminating the problem of low throughput caused by low transmission efficiency of the hard mask. The
success of this method therefore depends crucially on the etching selectivity of quartz to NIL resist used as the resist
mask. Using a newly developed NIL resist with high etching selectivity and duplicating by a "hard mask-less" method, a
125nm track pitch (TP), 2.5 inch full-surface quartz template with uniform pattern height was fabricated. A 75nm TP
quartz template of 60nm pattern height was also fabricated using this method.
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