Ferroelectric and magnetic properties in 85 nm-thick Bi6Fe2Ti3O18 thin films by a modified sol-gel processing

Abstract Bi 6 Fe 2 Ti 3 O 18 thin film on Pt/Ti/SiO 2 /Si substrate with a thickness of 85 nm is successfully prepared by a monoethanolamine-modified sol-gel processing. The prepared thin film is polycrystalline and shows dense morphology. The room temperature remnant polarization is higher than 10 μC cm −2 at 5 V driving voltage both from polarization-voltage hysteresis loop and positive-up negative-down measurements. The polarization after 10 7 switching cycles and a retention time of 10 4 s shows no obvious degradation, suggesting good fatigue-resistant characteristics. Weak ferromagnetism is observed at 5 K with a saturated magnetic moment of 11.7 emu/cm 3 . The results will provide an effective route to optimize Bi 6 Fe 2 Ti 3 O 18 thin films with thickness below 100 nm by low-voltage driving.