Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3101373
Keywords
annealing; diffusion; nanopatterning; nanostructured materials; polymer blends; segregation; self-assembly
Categories
Funding
- NSF [DMR0705368]
- ONR-MURI [N000140110761]
- ARO-MURI [28D1083899]
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Spontaneously self-assembled onion-type nanostructures based on block copolymers as templating materials are reported. Polystyrene-poly(ethylene oxide) diblock copolymer containing CoFe2O4 and Pb-1.1(Zr0.53Ti0.47)O-3 precursors segregated to the two microdomains forms well-ordered templated lamellar structures. Onion-type nanostructures have been induced by room temperature solvent annealing for 64 h in a magnetic field of 0.8 T oriented perpendicularly to the plane of film. The recorded images suggest that the Lorentz force acting on charges in the paraelectric precursor induces a circular component of the diffusion flux that leads to the onion formation. This templating process opens a route for nanometer-scale patterning of magnetic toroids.
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