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首页> 外文期刊>Physica, B. Condensed Matter >Thickness dependence of microstructures in La0.9Sr0.1MnO3 thin films grown on exact-cut. and miscut SrTiO3 substrates
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Thickness dependence of microstructures in La0.9Sr0.1MnO3 thin films grown on exact-cut. and miscut SrTiO3 substrates

机译：精确切割生长的La0.9Sr0.1MnO3薄膜的微观结构对厚度的依赖性。和错误切割的SrTiO3基板

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摘要

The thickness dependence of microstructures of La0.9Sr0.1MnO3 (LSMO) thin films grown on exact-cut and miscut SrTiO3 (STO) substrates, respectively, was investigated by high-angle X-ray diffraction (HXRD), X-ray small-angle reflection (XSAR), X-ray reciprocal space mapping and atomic force microscopy (AFM). Results show that the LSMO films are in pseudocubic structure and are highly epitaxial [001]-oriented growth on the (001) STO substrates. The crystalline quality of the LSMO film is improved with thickness. The epitaxial relationship between the LSMO films and the STO substrates is [001](LSMO)parallel to[001](EXACT-STO), and the LSMO films have a slight mosaic structure along the q(x) direction for the samples grown on the exact-cut STO substrates. However, an oriented angle of about 0.24 degrees exists between [001](LSMO) and [001](MISCUT-STO), and the LSMO films have a mosaic structure along the q(z) direction for that grown on the miscut STO substrates. The mosaic structure of both groups of the samples tends to reduce with thickness. The diffraction intensity of the (004) peaks increases with thickness of the LSMO film. The XSAR and AFM observations show that for both groups, the interface is sharp and the surface is rather smooth. The mechanism was discussed briefly. (c) 2007 Elsevier B.V. All rights reserved.
机译：通过高角度X射线衍射（HXRD），X射线小尺寸X射线衍射研究了分别在精确切割和错误切割的SrTiO3（STO）衬底上生长的La0.9Sr0.1MnO3（LSMO）薄膜的微观结构对厚度的依赖性。角反射（XSAR），X射线相互空间映射和原子力显微镜（AFM）。结果表明，LSMO膜为伪立方结构，在（001）STO衬底上高度外延[001]取向生长。 LSMO膜的结晶质量随厚度而提高。 LSMO膜和STO衬底之间的外延关系是[001]（LSMO）平行于[001]（EXACT-STO），并且LSMO膜沿q（x）方向具有轻微的镶嵌结构，用于在上面生长的样品精确切割的STO基板。但是，在[001]（LSMO）和[001]（MISCUT-STO）之间存在约0.24度的定向角，并且LSMO膜具有沿q（z）方向的马赛克结构，该马赛克结构生长在错切的STO基板上。两组样品的镶嵌结构趋于随厚度减小。 （004）峰的衍射强度随着LSMO膜的厚度而增加。 XSAR和AFM的观察结果表明，对于这两个组，界面都是尖锐的，表面相当光滑。简要讨论了该机制。 （c）2007 Elsevier B.V.保留所有权利。

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