Multiferroic and magnetoelectric properties of CoFe2O4/Pb1-xSrxTiO3 composite films

To realize muhiferroic and magnetoelectric properties, hi-layered nanocomposite films consisting of CoFe2O4 (CF0)/Phi_xSrxTiO(3) (PST) phases 0.1, 0.2, and 0.3) have been deposited on Pt/ TiO2/SiO2/Si substrate by using a metallo-organic decomposition process. Both the PST perovskite and the CFO spine] phases are confirmed from X-ray diffraction patterns and Raman spectra of the composite films. The composite films exhibit room temperature muhiferroic properties. The values of saturation magnetization (M-s), remanent magnetization (M-r), and coercive field (H-c) of the composite films are in the range of 108-119 kA/m, 42-51 kA/m. and 44.5-64.1 IkA/m. respectively. In addition, the saturation polarization (P-s), remanent polarization (P-r), and electrical coercive field (E-c) are observed in the range of 11.3-14.4 mu C/cm(2), 2.9-4.8 mu C/cm(2), and 56-59.5 kV/cm, respectively. The dielectric response in the presence of applied magnetic field, H-dc similar to 238.6 kA/m shows a high magnetocapacitance value similar to 385% at frequency 100 kHz for CFO/PST composite film with x 0.1. The maximum magnetoelectric voltage co-efficient value, alpha(E) similar to 380 -kV/(m x T) has been achieved in the composite films with x = 0.1. The influence of elastic/and or interfacial strain on multiferroic magnetoelectric properties is evident from the results. (C) 2015 AIP Publishing LLC.