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arXiv 0902.3164cond-mat.mtrl-sci
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BiFeO3薄膜和(BiFeO3)m(SrTiO3)m超晶格中局域铁电性的研究

Probing of local ferroelectricity in BiFeO3 thin films and (BiFeO3)m(SrTiO3)m superlattices

R. Ranjith, U. Luders, W. Prellier, A. Da Costa, I. Dupont, R. Desfeux

摘要:

采用脉冲激光烧蚀法在(001)取向SrTiO 3衬底上制备了BiFeO 3薄膜和人工超晶格(BiFeO 3)m(SrTiO 3)m(m~ 1 ~ 10个晶胞)。研究了漏电流和宏观极化随周期性的变化规律。压电力显微镜的研究表明,在BiFeO 3薄膜的情况下,大的铁电畴的存在下,而在超晶格结构的情况下,观察到的铁电畴的尺寸减小。结果表明,通过超晶格对铁电畴的改性,可以提供一个额外的控制工程畴壁介导的功能特性。

英文摘要:

Ferroelectric BiFeO3 thin films and artificial superlattices of (BiFeO3)m(SrTiO3)m (m~ 1 to 10 unit cells) were fabricated on (001)-oriented SrTiO3 substrates by pulsed laser ablation. The variation of leakage current and macroscopic polarization with periodicity was studied. Piezo force microscopy studies revealed the presence of large ferroelectric domains in the case of BiFeO3 thin films while a size reduction in ferroelectric domains was observed in the case of superlattice structures. The results show that the modification of ferroelectric domains through superlattice, could provide an additional control on engineering the domain wall mediated functional properties.

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