Abstract

Bi6Fe2Ti3O18 thin film on Pt/Ti/SiO2/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 107 switching cycles and a retention time of 104 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/cm3. The results will provide an effective route to optimize Bi6Fe2Ti3O18 thin films with thickness below 100 nm by low-voltage driving.

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