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Directed Self‐Assembly as a Route to Ferromagnetic and Superparamagnetic Nanoparticle Arrays
Author(s) -
Schelhas Laura T.,
Farrell Richard A.,
Halim Udayabagya,
Tolbert Sarah H.
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201401921
Subject(s) - materials science , superparamagnetism , polymer , nanoparticle , nanotechnology , ferromagnetism , nanocrystal , self assembly , layer (electronics) , magnetic nanoparticles , deposition (geology) , coating , atomic layer deposition , magnetization , condensed matter physics , magnetic field , composite material , paleontology , physics , quantum mechanics , sediment , biology
Block co‐polymer patterns are attractive candidates for nanoparticle assemblies. Directed self‐assembly of block co‐polymers in particular allows for long range ordering of the patterns, making them interesting scaffolds for the organization of magnetic particles. Here, a method to tune the channel width of polymer‐derived trenches via atomic layer deposition (ALD) of alumina is reported. The alumnia coating provides a much more thermally robust pattern that is stable up to 250 °C. Using these patterns, magnetic coupling in both ferromagnetic and superparamagnetic nanocrystal chains is achieved.