文摘
In this study, advanced control of crystallographic orientations and magnetic properties of self-assembled nanostructures via rational selections of substrates is demonstrated. We show that in the perovskite−spinel BiFeO<sub>3sub>−CoFe<sub>2sub>O<sub>4sub> model system the crystal orientation of self-assembled CoFe<sub>2sub>O<sub>4sub> nanopillars can be tuned among (001), (011), and (111), while that of the BiFeO<sub>3sub> matrix is fixed in (001). Moreover, the resultant CoFe<sub>2sub>O<sub>4sub> nanopillars appear in various shapes: pyramid, roof, and triangular platform, respectively. The tunable nanostructures through this approach enable the control of material functionality such as the magnetic anisotropy of CoFe<sub>2sub>O<sub>4sub>. This study opens a new pathway for the engineering of self-assembled heteroepitaxial nanostructures.