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, two-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 three-dimensional floral patterns of self-assembled nanoplates. Unsaturated polarization loops obtained for BiFeO₃ confirmed the leakage behaviour of these rhombohedrally distorted cubic perovskites. These loops were then used to determine the energy density of the BiFeO₃ perovskites. Enhanced ferromagnetic behaviour with high coercivity and remanence was observed for these nanoplates. A detailed discussion about the origin of ferromagnetic behaviour based on Goodenough–Kanamori's rule is also a part of this paper. Impedance spectroscopy revealed a true Warburg capacitive behaviour of the synthesized nanoplates. High magneto-electric (ME) coefficient of 27 mV cm⁻¹ Oe⁻¹ at a bias field of −0.2 Oe was observed which confirmed the existence of ME coupling in these nanoplates.

纳米结构的受控生长在调节先进能源和记忆存储设备功能材料的物理和化学性质方面发挥着至关重要的作用。在此，我们使用简单的乙二醇介导的溶剂热方法，通过自组装Co和Ni掺杂的BiFeO ₃的高度结晶的二维纳米板，合成了分级微米花。纯BiFeO ₃获得了直径接近60nm的分散一维纳米棒型形态。 Co和Ni在BiFeO ₃中的Fe位共掺杂不会破坏形态的稳定性；相反，它会产生自组装纳米板的三维花卉图案。 BiFeO ₃获得的不饱和极化环证实了这些菱形扭曲立方钙钛矿的泄漏行为。然后使用这些环来确定 BiFeO ₃钙钛矿的能量密度。这些纳米板观察到具有高矫顽力和剩磁的增强铁磁行为。基于古迪纳夫-金森法则对铁磁行为起源的详细讨论也是本文的一部分。阻抗谱揭示了合成纳米板的真实 Warburg 电容行为。在-0.2 Oe的偏置场下观察到27 mV cm ^-1 Oe ^-1的高磁电（ME）系数，这证实了这些纳米板中ME耦合的存在。