Self-assembled multiferroic nanostructures in the CoFe_2O_4-PbTiO_3 system

摘要

The effect of substrate orientation on the morphologies of epitaxial self-assembled nanostructures was demonstrated using multiferroic 0.67PbTiO_3-0.33CoFe_2O_4 thin films. The two-phase composite films were grown by pulsed laser deposition on single crystal SrTiO_3 substrates having (001) and (110) orientations. The nanostructures of both orientations consisted of vertical rod- or platelet-like columns of CoFe_2O_4 dispersed in a PbTiO_3 matrix. For the (001) orientation the platelet habits were parallel to the {110} planes, whereas for the (110) orientation the platelets were parallel to the {111} planes. The differences were explained using a thermodynamic theory of heterophase structures.