title: Hierarchical templating of a BiFeO3-CoFe2O4 multiferroic nanocomposite by a triblock terpolymer film.
abstract: A process route to fabricate templated BiFeO3/CoFe2O4 (BFO/CFO) vertical nanocomposites is presented in which the self-assembly of the BFO/CFO is guided using a self-assembled triblock terpolymer. A linear triblock terpolymer was selected instead of a diblock copolymer in order to produce a square-symmetry template, which had a period of 44 nm. The triblock terpolymer pattern was transferred to a (001) Nb:SrTiO3 substrate to produce pits that formed preferential sites for the nucleation of CFO crystals, in contrast to the BFO, which wetted the flat regions of the substrate. The crystallographic orientation and magnetic properties of the templated BFO/CFO were characterized.
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Hong Kyoon
authors.initials: HK
authors.lastname: Choi
authors.forename: Nicolas M
authors.initials: NM
authors.lastname: Aimon
authors.forename: Dong Hun
authors.initials: DH
authors.lastname: Kim
authors.forename: Xue Yin
authors.initials: XY
authors.lastname: Sun
authors.forename: Jessica
authors.initials: J
authors.lastname: Gwyther
authors.forename: Ian
authors.initials: I
authors.lastname: Manners
authors.forename: Caroline A
authors.initials: CA
authors.lastname: Ross
keywords: directed self-assembly; spinel-perovskite nanocomposite; triblock terpolymer