title: Preparation and characterization of self-assembled percolative BaTiO3-CoFe2O4nanocomposites via magnetron co-sputtering.
abstract: BaTiO3-CoFe2O4composite films were prepared on (100) SrTiO3substrates by using a radio-frequency magnetron co-sputtering method at 750 °C. These films contained highly (001)-oriented crystalline phases of perovskite BaTiO3and spinel CoFe2O4, which can form a self-assembled nanostructure with BaTiO3well-dispersed into CoFe2O4under optimized sputtering conditions. A prominent dielectric percolation behavior was observed in the self-assembled nanocomposite. Compared with pure BaTiO3films sputtered under similar conditions, the nanocomposite film showed higher dielectric constants and lower dielectric losses together with a dramatically suppressed frequency dispersion. This dielectric percolation phenomenon can be explained by the 'micro-capacitor' model, which was supported by measurement results of the electric polarization and leakage current.
authors.affiliation: Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
authors.forename: Meiling
authors.initials: M
authors.lastname: Yuan
authors.affiliation: Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
authors.forename: Limin
authors.initials: L
authors.lastname: Kang
authors.affiliation: Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
authors.forename: Junxiao
authors.initials: J
authors.lastname: Feng
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Pan
authors.affiliation: Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China; Suzhou Institute of Shandong University, Suzhou, 215123, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Ouyang
keywords: Dielectric percolation; Ferroelectric–ferromagnetic composite (FFC); Magnetron co-sputtering; Multiferroics; Nanocomposite films; Self-assembly