Magnetocapacitance and impedance spectroscopy of Ba_(0.7)Sr_(0.3)TiO3/La_(0.67)Sr_(0.33)MnO3 and Ba_(0.8)Sr_(0.2)TiO3/ La_(0.67)Sr_(0.33)MnO3 thin film heterostructures

摘要

The paper discuses synthesis of Ba_(0.7)Sr_(0.3)TiO3/ La_(0.67)Sr_(0.33)MnO3 and Ba_(0.8)Sr_(0.2)TiO3/La_(0.67)Sr_(0.33)MnO3 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)TiO3, Ba_(0.8)Sr_(0.2)TiO3 and La_(0.67)Sr_(0.33)MnO3 thin films. The observed variation of Cp, tan δ, magnetocapacitance (Me), 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.