Structures and local ferroelectric polarization switching properties of orthorhombic YFeO₃ thin film prepared by a sol–gel method

【摘要】 Orthorhombic YFeO₃ thin film was prepared on La_0.67Sr_0.33MnO₃/LaAlO₃ substrate by a sol-gel spin-coating method. The structures of the YFeO₃/La_0.67Sr_0.33MnO₃/LaAlO₃（YFO/LSMO/LAO） sample were detected by x-ray diffraction pattern, Raman spectrometer, scanning electron microscopy, and atomic force microscope. The local ferroelectric polarization switching properties of the orthorhombic YFO film were confirmed by piezoresponse force microscopy（PFM） for the first time. The results show that the YFO film deposited on LSMO/LAO possesses orthorhombic structure,with ultra-fine crystal grains and flat surface. The leakage current of the YFO film is 8.39 × 10^-4 A·cm^-2 at 2 V,with its leakage mechanism found to be an ohmic behavior. PFM measurements indicate that the YFO film reveals weak ferroelectricity at room temperature and the local switching behavior of ferroelectric domains has been identified. By local poling experiment, polarization reversal in the orthorhombic YFO film at room temperature was further observed.更多还原

【Abstract】 Orthorhombic YFeO₃ thin film was prepared on La_0.67Sr_0.33MnO₃/LaAlO₃ substrate by a sol-gel spin-coating method. The structures of the YFeO₃/La_0.67Sr_0.33MnO₃/LaAlO₃（YFO/LSMO/LAO） sample were detected by x-ray diffraction pattern, Raman spectrometer, scanning electron microscopy, and atomic force microscope. The local ferroelectric polarization switching properties of the orthorhombic YFO film were confirmed by piezoresponse force microscopy（PFM） for the first time. The results show that the YFO film deposited on LSMO/LAO possesses orthorhombic structure,with ultra-fine crystal grains and flat surface. The leakage current of the YFO film is 8.39 × 10^-4 A·cm^-2 at 2 V,with its leakage mechanism found to be an ohmic behavior. PFM measurements indicate that the YFO film reveals weak ferroelectricity at room temperature and the local switching behavior of ferroelectric domains has been identified. By local poling experiment, polarization reversal in the orthorhombic YFO film at room temperature was further observed.更多还原