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

Zheng, H.; Wang, J.; Mohaddes-Ardabili, L.; Wuttig, M.; Salamanca-Riba, L.; Schlom, D. G.; Ramesh, R.
September 2004
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2035
Academic Journal
Self-assembled BaTiO3–CoFe2O4 complex oxide nanostructures have been synthesized by pulsed laser deposition. A single ceramic target with a molar ratio of 0.62BaTiO3–0.38CoFe2O4 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 950°C, the average diameter of the pillars increases from ∼9 to ∼70 nm.


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