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

• 来源期刊: 中国物理B（英文版）
• 关键词: multiferroics YFeO3 thin film orthorhombic structure piezoresponse force microscopy
• 年，卷（期）: 2019,（3）
• 页码范围: 353-357
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/3/037701

摘要

Orthorhombic YFeO3 thin film was prepared on La0.67Sr0.33MnO3/LaAlO3 substrate by a sol-gel spin-coating method.The structures of the YFeO3/La0.67Sr0.33MnO3/LaA1O3 (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.