Controlled growth of nanostructures plays a vital role in tuning the physical and chemical properties of functional materials for advanced energy and memory storage devices. Herein, we synthesized hierarchical micro-sized flowers, built by the self-assembly of highly crystalline, 2-dimensional nanoplates of Co and Ni doped BiFeO₃, using a simple ethylene glycol mediated solvothermal method. Pure BiFeO₃ attained scattered one-dimensional nanorods-type morphology having diameter nearly 60 nm. Co-doping of Co and Ni at Fe-site in BiFeO₃ does not destabilize the morphology; rather it generates 3-dimensinal floral patterns of self-assembled nanoplates. Unsaturated polarization loops obtained for BiFeO₃ confirmed the leakage behavior of these rhombohedrally distorted cubic perovskites. These loops were then utilized to determine the energy density of the BiFeO₃ perovskites. Enhanced ferromagnetic behavior with high coercivity and remanence was observed for these nanoplates. A detailed discussion about the origin of ferromagnetic behavior based on Goodenough-Kanamori’s rule is also a part of this paper. Impedance spectroscopy revealed a true Warburg capacitive behavior of the synthesized nanoplates. High magneto-electric coefficient of 27 mV/cm.Oe at a bias field of -0.2 Oe was observed which confirmed the existence of magneto-electric coupling in these nanoplates.

This is an experimental data, obtained uisng various apparatusses as mentioned in the experimental section of the manuscript. For example, the diffraction data was obtained using an XRD, dielectric data was obtained using Wayne Kerr Impdedance Analyzer and multiferroic data was obtained using a Multiferroic Tester. The data was analyzed and processed using conventional formulae as mentioned in the last page of this dataset file and also mentioned in the manuscript.