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Ultrahigh-Density Nanowire Arrays Grown in Self-Assembled Diblock Copolymer Templates
T. Thurn-Albrecht,1J. Schotter,2G. A. Kästle,2N. Emley,2T. Shibauchi,34L. Krusin-Elbaum,3K. Guarini,3C. T. Black,3M. T. Tuominen,2*T. P. Russell1*
We show a simple, robust, chemical route to the
fabrication of ultrahigh-density arrays of nanopores with high
aspect ratiosusing the equilibrium self-assembled morphology of
asymmetricdiblock copolymers. The dimensions and lateral density of
thearray are determined by segmental interactions and the copolymermolecular weight. Through direct current electrodeposition, wefabricated vertical arrays of nanowires with densities in excessof
1.9 × 1011 wires per square centimeter. We
found markedly enhanced coercivitieswith ferromagnetic cobalt
nanowires that point toward a routeto ultrahigh-density storage media.
The copolymer approach describedis practical, parallel, compatible
with current lithographic processes,and amenable to multilayered
device fabrication.
1 Polymer Science and Engineering
Department,
2 Physics Department, University
of Massachusetts, Amherst, MA 01003, USA.
3 IBM
T. J. Watson Research Center, Yorktown Heights, NY 10598, USA.
4 Los Alamos National Laboratory, Los Alamos, NM
87545, USA.
*
To whom correspondence should be addressed. E-mail:
tuominen{at}physics.umass.edu (M.T.T.); russell{at}mail.pse.umass.edu
(T.P.R.)
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