Three-dimensional heteroepitaxy in self-assembled BaTiO3-CoFe2O4 nanostructures

摘要

Self-assembled BaTiO3-CoFe2O4 complex oxide nanostructures have been synthesized by pulsed laser deposition. A single ceramic target with a molar ratio of 0.62BaTiO(3)-0.38CoFe(2)O(4) was used. Spinel CoFe2O4 and perovskite BaTiO3 phases spontaneously separated during heteroepitaxial growth on a single-crystal SrTiO3 (001) substrate. The nanostructures are epitaxial in-plane as well as out-of-plane, with CoFe2O4 nanopillar arrays embedded in a BaTiO3 matrix. The CoFe2O4 nanopillars have uniform size and spacing and nearly circular cross section. As the substrate temperature increases from 750 to 950degreesC, the average diameter of the pillars increases from similar to9 to similar to70 nm. (C) 2004 American Institute of Physics.