Surface double-layer structure in (110) oriented BiFeO3 thin film

Surface double-layer structure in (110) oriented BiFeO3 thin film
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(110)取向BiFeO3薄膜的表面双层结构

DOI:
10.1063/1.4902113
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发表时间:
2014-11
影响因子:
4
通讯作者:
Li, Xiaolong
Li, Xiaolong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jin, Kuijuan;Gao, Xingyu;Li, Zhong;Li, Xiaolong

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采用脉冲激光沉积方法在SrRuO3覆盖的SrTiO3(110)衬底上生长BiFeO3薄膜,发现其表面有不同于内部的双层结构。结果表明,BiFeO3薄膜呈现单畴外延相。x -射线反射率和x -射线光电子能谱结果表明,该材料的皮肤层厚度小于1 nm,电子密度降低,表面状态不同。掠入射x射线衍射证实了表面蒙皮层下数nm的表面多畴结构。双层近表面结构是由应变单畴结构产生的大退极化场引起的。
Surface double-layer structure different from the interior was found in BiFeO3 thin film grown on SrRuO3 covered SrTiO3 (110) substrate by pulsed laser deposition. It was shown that BiFeO3 film exhibits epitaxial phase with single domain. X-ray reflectivity and X-ray photoelectron spectroscopy results revealed a skin layer of less than 1 nm with a reduced electron density and different surface state. Grazing incidence x-ray diffraction convinced a surface multi-domain structure of several nm beneath the surface skin layer. The double-layer near surface structure would be originated from the large depolarization field produced by the single-domain structure with strain.
DOI: 10.1103/physrevb.87.220101
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