物理学报Issue(18)：1-6,6.DOI:10.7498/aps.63.187701
YMnO3薄膜的铁电行为及其纳米尺度铁电畴的研究
Study on ferro electric b ehaviors and ferro electric nano domains of YMnO3 thin film
摘要
Abstract
Hexagonal YMnO3 is a special kind of multiferroics which shows unique advantages in magneto-electric field due to its low permittivity and only c-axis polarization. However, its ferroelectric properties, especially domain structures, have not been intensively investigated. In this study, YMnO3 film about 270 nm in thickness is prepared on Si(100) substrate by sol-gel spin coating. Structure and morphology of the film are characterized by grazing incidence X-ray diffraction and atomic force microscopy. Domain structure and its reversal behavior on a nanoscale are examined by piezoresponse force microscopy (PFM). The leakage current and ferroelectric property are also investigated. The results show that the film displays a hexagonal perovskite structure with good crystallinity and has smooth surface with a root-mean-square roughness of 7.209 nm. PFM images and typical local piezoresponse loops reveal the good piezoelectric and ferroelectric properties of the YMnO3 film at room temperature. Meanwhile, the offsets of amplitude loop and phase loop are observed due to the internal electric field. Leakage current density of YMnO3 film is lower than 10-6 A·cm-2, so saturated hysteresis loop can be obtained.关键词
YMnO3/铁电性/压电力显微镜Key words
YMnO3/ferroelectricity/piezoresponse force microscopy引用本文复制引用
张润兰,邢辉,陈长乐,段萌萌,罗炳成,金克新..YMnO3薄膜的铁电行为及其纳米尺度铁电畴的研究[J].物理学报,2014,(18):1-6,6.基金项目
国家自然科学基金(批准号:61078057,51202195,511172183)、高等学校博士学科点专项科研基金(批准号:20126102110045)和西北工业大学基础研究基金(批准号：JC201271, JC20120246)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.61078057,51202195,511172183), Research Fund for the Doctoral Program of Higher Education of China (Grant No.20126102110045), NPU Foundation for Fundamental Research, China (Grant Nos. JC201271, JC20120246) （批准号:61078057,51202195,511172183）
