We have produced, by thermal decomposition of an organometallic complex in a bulk film
of P(S-b-2VP), nonagglomerated cobalt nanoparticles that exhibit significant room-temperature magnetic coercivity. The particles are patterned on the nanoscale: they reside within
the P2VP domains of the block copolymer morphology. These results are made possible by
the selective sequestration of the organometallic complex into these domains in amounts
sufficient to nucleate and grow substantial quantities of cobalt nanoparticles that are larger
than the size required for ferromagnetic behavior. The in situ synthesis of ferromagnetic
nanoparticles selectively inside the P2VP domains of P(S-b-2VP) block copolymer films has
been demonstrated.
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