Magnetocapacitance and impedance spectroscopy of Ba0.7Sr0.3TiO3/La0.67Sr0.33MnO3 and Ba0.8Sr0.2TiO3/La0.67Sr0.33MnO3 thin film heterostructures

The paper discuses synthesis of Ba 0.7 Sr 0.3 TiO 3 /La 0.67 Sr 0.33 MnO 3 and Ba 0.8 Sr 0.2 TiO 3 /La 0.67 Sr 0.33 MnO 3 thin film heterostructures by sol–gel (citrate gel route) method. The XRD spectra are determined for confirmation of crystalline phases of Ba 0.7 Sr 0.3 TiO 3 , Ba 0.8 Sr 0.2 TiO 3 and La 0.67 Sr 0.33 MnO 3 thin films. The observed variation of Cp, tan δ, magnetocapacitance (Mc), real part of dielectric constant ε′, imaginary part of dielectric constant ε″as a function of frequency, magnetoresistance R(H) and magnetoimpedance Z(H) are presented in the paper. Further the observed impedance spectra as a function of frequency f is also presented in the paper. The observed variation of Mc is qualitatively correlated with the stress induced effect and magnetoresistasnce effect occurring simultaneously.