| Summary: | 碩士 === 國立交通大學 === 材料科學與工程學系 === 99 === In this study, advanced control of crystallographic orientations and magnetic properties of self-assembled nanostructures via rational selections of substrates are demonstrated. We show that in the perovskite-spinel BiFeO3-CoFe2O4 model system the crystal orientation of self-assembled CoFe2O4 nanopillars can be tuned among (001), (011), and (111) while that of BiFeO3 matrix is fixed in (001). Moreover, the resultant CoFe2O4 nanopillars appear in various shapes: pyramid, roof, and triangular platform respectively. The tunable nanostructures through this approach enable the control over material functionality such as the magnetic anisotropy of CoFe2O4. This study opens a new pathway for engineering of self-assembled hetero-epitaxial
nanostructures.
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