Abstract
(Sm, Cr) co-doped Bi0.89Sm0.11Fe0.97 Cr0.03O3 (BSFC)–NiFe2O4 (NFO) composition thin films were successfully prepared on FTO/glass (SnO2:F) substrates via a sol–gel method. The structure, surface morphology, leakage current, ferroelectricity and ferromagnetism of BSFC–NFO composition thin film have been investigated. X-ray diffraction analysis indicates that the thin film is polycrystalline and consisted of a rhombohedral perovskite (R3m space group) BiFeO3 phase and a cubic (Fd-3m space group) inverse spinel NiFe2O4 phase. The BSFC–NFO composition thin film is promising in practical application because of its well saturated ferromagnetic (Ms = 19.45 emu/cm3) and ferroelectric (Pr = 39 µC/cm2) hysteresis loops with low order of leakage current density (J = 6.73 × 10−6 A/cm2, at an applied electric field of 100 kV/cm). Which suggest the ferroelectric and ferromagnetic properties can be improved by this composition thin film structure. Moreover, the various conduction mechanisms of BSFC–NFO composition thin film have also been studied.
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