Herein we report the development of a core-shell-like $\mathit{Co}{\mathit{Fe}}_2{O}_4-\mathit{BaTi}{O}_3$ multiferroic nanocomposite (1:1 weight ratio) for their enhanced magnetoelectric coupling and energy storage density by the wet chemical route. Rietveld refinement analysis of the XRD pattern verified the formation of cubic spinel ($\mathit{Co}{\mathit{Fe}}_2{O}_4$) and tetragonal perovskite ($\mathit{BaTi}{O}_3$) structures. Whereas the SEM and EDX analysis confirmed the formation of core-shell-like morphology in the composite. The temperature dependence of dielectric permittivity showed two distinct peaks corresponding to the constituent phases´ structural phase transitions. However, the frequency dependence of low-temperature peak revealed an abnormal relaxor-type behavior, which is elucidated due to intrinsic structural defects that might cause alteration in the octahedron arrangement in $\mathit{BaTi}{O}_3$. Impedance spectroscopy analysis was utilized to calculate the activation energy (E_a) of respective phases, which was found to be > 1 eV that confirms the dominance of doubly ionized oxygen vacancies in governing the thermally stimulated conduction process. It was found that the prepared composite exhibited high dielectric permittivity (~2700) and moderate values of saturation magnetization (20 emu/g) and polarization (6.2 μC/cm²) along with low remnant polarization (3 μC/cm²) at room temperature. Moreover, we also observed enhanced energy storage efficiency (67%) and magnetoelectric coefficient (0.18 V/cm.Oe), which are explained due to strong interfacial coupling and reduced leakage current, making this composition promising for multifunctional device applications.

在这里，我们报告了核壳状 $\mathit{公司}{\mathit{铁}}_2{哦}_4-\mathit{巴蒂}{哦}_3$多铁性纳米复合材料（重量比为 1:1）通过湿化学途径增强了磁电耦合和能量存储密度。XRD图谱的Rietveld精修分析证实了立方尖晶石的形成（$\mathit{公司}{\mathit{铁}}_2{哦}_4$) 和四方钙钛矿 ($\mathit{巴蒂}{哦}_3$) 结构。而 SEM 和 EDX 分析证实了复合材料中核壳状形态的形成。介电常数的温度依赖性显示出两个不同的峰，对应于组成相的结构相变。然而，低温峰的频率依赖性揭示了异常的弛豫型行为，这是由于内在结构缺陷可能导致八面体排列的改变而阐明的。$\mathit{巴蒂}{哦}_3$. 阻抗谱分析用于计算各个相的活化能 (E _a )，发现其 > 1  eV，这证实了双电离氧空位在控制热刺激传导过程中的主导地位。发现制备的复合材料表现出高介电常数 (~2700) 和中等饱和磁化强度 (20  emu/g) 和极化 (6.2 μC/cm ² ) 以及低剩余极化 (3 μC/cm ² ) 在室温下温度。此外，我们还观察到增强的储能效率 (67%) 和磁电系数 (0.18 V/cm.Oe)，这归因于强界面耦合和减少的漏电流，使该组合物有望用于多功能设备应用。