摘要
The pattern configuration and interface structure in epitaxial BiFeO 3 -CoFe 2 O 4 heterostructures grown on (010) pc NdGaO 3 substrates have been investigated systematically by transmission electron microscopy and chemical analysis. The crystal orientation of CoFe 2 O 4 variants was tuned to [111] CFO , while BiFeO 3 kept [010] pc matching the substrate. Triangular prism-shaped CoFe 2 O 4 embedded in the BiFeO 3 matrix grew as an equilibrium island mode with {111} CFO as its surfaces and interfaces. Two types of BiFeO 3 -CoFe 2 O 4 orientation relationships were determined as (001)[010] BFO //(0-22)[111] CFO and (101)[010] BFO //(-220)[111] CFO . The results reveal that the dominant factors controlling the growth orientation of the present vertical heterostructures are surface energy anisotropy and atomic structure continuity. © 2013 American Institute of Physics.