外延BiFeO3多铁性纳米岛的化学自组织法制备及其表征

doi:10.3724/SP.J.1077.2010.01252

无机材料学报 ›› 2010, Vol. 25 ›› Issue (12): 1252-1256.DOI: 10.3724/SP.J.1077.2010.01252 CSTR: 32189.14.SP.J.1077.2010.01252

外延BiFeO₃多铁性纳米岛的化学自组织法制备及其表征

朱信华, 杭启明, 邢智彪, 汤振杰, 宋晔, 朱健民, 刘治国

(南京大学物理学院固体微结构物理国家重点实验室, 南京 210093)

收稿日期:2010-03-23 修回日期:2010-05-11 出版日期:2010-12-20 网络出版日期:2010-11-24
基金资助:
国家自然科学基金(10874065); 国家973项目(2009CB929503)

Epitaxial BiFeO₃ Multiferroic Nanoislands Fabricated by Chemical Assembled Method and Their Characterization

ZHU Xin-Hua, HANG Qi-Ming, XING Zhi-Biao, TANG Zhen-Jie, SONG Ye, ZHU Jian-Min, LIU Zhi-Guo

(National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China)

Received:2010-03-23 Revised:2010-05-11 Published:2010-12-20 Online:2010-11-24
Supported by:
National Nature Science of China(10874065); 973 Program(2009CB929503)

摘要/Abstract

摘要： 采用化学自组织方法在SrTiO₃ (100)及Nb-掺杂 SrTiO₃ (100) 单晶衬底上制备了外延BiFeO₃纳米岛, 并利用X射线衍射、扫描电子显微镜和原子力显微镜对纳米岛的相结构及形貌进行了表征. 结果表明, 在650~800℃下后退火1h可获得外延的BiFeO₃纳米岛, 岛横向尺寸在50~150 nm之间, 纵向尺寸在6~12 nm之间. 随着纳米岛后退火温度的升高, 其(100)面内的几何形貌由三角形状转向四边形状, 然后再趋向于长棒状. 利用压电力显微镜, 对单个BiFeO₃纳米岛(横向尺寸~50 nm, 高度12 nm)的铁电特性进行表征. 结果表明, 单个外延BiFeO₃纳米岛内存在分形铁电畴和自偏压极化现象, 其中自偏压极化现象来源于外延BiFeO₃纳米岛与SrTiO₃单晶衬底之间的界面应力.

关键词: BiFeO₃, 外延纳米岛, 化学自组织法, 结构与物性

Abstract: Epitaxial BiFeO₃nanoislands were fabricated on SrTiO₃ (100) single crystal and Nb-doped SrTiO₃ (100) single crystal substrates by chemical assembled method. Their phase structure and morphology were characterized by X-ray diffraction, scanning electron microscope, and atomic force microscope, respectively. The results showed that epitaxial BiFeO₃nanoislands could be obtained by post-annealing in the temperature range of 650-800℃, and their lateral sizes were in the range of 50-150 nm and height of 6-12 nm. With increasing the post-annealing temperatures, the morphology of BiFeO₃nanoisland in the (100) growth plane evolved from tri-angle to square, and then to long rod shape. By using piezo-force microscope, ferroelectric characteristics of single epitaxial BiFeO₃nanoisland grown on Nb-doped SrTiO₃ (100) single crystal substrates with lateral size of about 50 nm and height of 12 nm was characterized. The results demonstrated that fractal ferroelectric domains existed in the single BiFeO₃ nanoisland, and self-biased polarization effect was also observed within the nanoisland. This phenomenon was ascribed to interfacial stress caused by the lattice misfit between the BiFeO₃ nanoisland and the SrTiO₃single crystal substrate.

Key words: BiFeO₃, epitaxial nanoislands, chemical assembled method, structure and physical property

中图分类号:

朱信华, 杭启明, 邢智彪, 汤振杰, 宋晔, 朱健民, 刘治国. 外延BiFeO₃多铁性纳米岛的化学自组织法制备及其表征[J]. 无机材料学报, 2010, 25(12): 1252-1256.

ZHU Xin-Hua, HANG Qi-Ming, XING Zhi-Biao, TANG Zhen-Jie, SONG Ye, ZHU Jian-Min, LIU Zhi-Guo. Epitaxial BiFeO₃ Multiferroic Nanoislands Fabricated by Chemical Assembled Method and Their Characterization[J]. Journal of Inorganic Materials, 2010, 25(12): 1252-1256.

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外延BiFeO₃多铁性纳米岛的化学自组织法制备及其表征

Epitaxial BiFeO₃ Multiferroic Nanoislands Fabricated by Chemical Assembled Method and Their Characterization

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