Finding appropriate magnetic properties of BiFeO3-CoFe2O4 vertically aligned nanocomposite by modulating the structure of BiFeO3 matrix and composition ratio of CoFe2O4 nanopillars for memory device applications

The interplay between structure and magnetic couplings is essential for scientific research and designing func-tional oxide BiFeO3 (BFO)-CoFe2O4 (CFO) heteroepitaxy on demand. Several research has been conducted to study this coupling mechanism such as by using various substrates to modify the strain state of BFO-CFO via misfit strain hence altering the magnetic anisotropy and further magnetoelectric coupling. In this present research, we investigate the effect of the composition ratio of CFO nanopillars on the magnetic properties of BFO-CFO heteroepitaxy to shed light on the relation between the strain and interfacial effect of nanopillars-matrix in this system. The difference ratio of BFO and CFO compositions in the system induces a modification of the vertical strain imposed on the BFO and CFO phases hence the interfacial coupling between them is also modified. The magnetic anisotropy of the samples varies depending upon the composition ratio of BFO and CFO phases indicating the effect of modulation of strain-state modification on magnetic coupling behavior in the BFO-CFO system.