Enhancement in the magneto-dielectric and ferroelectric properties of BaTiO3-CoFe1.9Yb0.1O4 core-shell multiferroic nanocomposite

Herein we report the dielectric, ferroelectric, magnetocapacitance and energy storage density properties of CoYb0.1Fe1.9O4-BaTiO3 core-shell multiferroic nano-composite synthesized by the combination of co-precipitation and sol-gel method. The XRD spectra revealed that the ferroelectric BT phase is compatible with the magnetic YbCFO phase. Scanning Electron microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDS) and Transmission Electron Microscopy (TEM) confirmed the formation of core-shell like structure in the composite. The magnetic and ferroelectric phase preserves their basic individual properties in the core-shell form. The temperature dependence of dielectric permittivity showed a sharp phase transition from cubic to tetragonal structure of the core-shell composite at 312.726 K. Frequency dependent dielectric study shows an enhanced value of permittivity (36905.0218) along with low dielectric losses (1.354). It was found that the prepared composite exhibited moderate values of saturation magnetization (3.379 emu/g) and polarization (5.146 mu C/cm2) along with low remnant polarization (1.777 mu C/cm2) at room temperature. Moreover, we also observed enhanced energy storage efficiency (60%) and magneto-capacitance (5.853%) which are explained due to strong interfacial coupling and reduced leakage current, making this composite promising for multifunctional device applications.

Automated summary

In this study, we synthesized a CoYb0.1Fe1.9O4-BaTiO3 core-shell multiferroic nano-composite using the co-precipitation and sol-gel method. The composite exhibited strong interfacial coupling and reduced leakage current, leading to enhanced energy storage efficiency (60%) and magneto-capacitance (5.853%). The composite also showed moderate values of saturation magnetization (3.379 emu/g) and polarization (5.146 mu C/cm2) along with low remnant polarization (1.777 mu C/cm2) at room temperature.