Morphology and microstructure of BaTiO3/SrTiO3 superlattices grown on SrTiO3 by laser molecular-beam epitaxy

N. Wang; H. B. Lu; W. Z. Chen; T. Zhao; F. Chen; H. Y. Peng; S. T. Lee; G. Z. Yang

doi:10.1063/1.125297

Morphology and microstructure of BaTiO₃/SrTiO₃ superlattices grown on SrTiO₃ by laser molecular-beam epitaxy

N. Wang
, H. B. Lu
, W. Z. Chen
, T. Zhao
, F. Chen
, H. Y. Peng
, S. T. Lee
, G. Z. Yang

Centre of Super-Diamond and Advanced Films

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

25 Citations (Scopus)

Abstract

The morphology and microstructure of BaTiO₃/SrTiO₃ (BTO/STO) superlattices grown epitaxially on STO (001) substrates by a computer-controlled laser molecular-beam epitaxy deposition system have been characterized by means of atomic force microscopy and high-resolution transmission electron microscopy (HRTEM). It is found that the HRTEM images taken along the [120] direction of BTO and STO show the maximal contrast difference. It is, therefore, observed that the superlattices consist of a highly oriented and single-crystalline multilayered structure. As identified by HRTEM, the number of unit cells in each BTO or STO layer matches very well with that obtained from reflection high-energy electron diffraction oscillations. The surfaces and interfaces of the superlattices are atomically smooth. In the superlattices, the ratio between the c axis of BTO and STO is about 4% larger than that measured from BTO or STO bulk crystals. © 1999 American Institute of Physics.

Original language	English
Pages (from-to)	3464-3466
Journal	Applied Physics Letters
Volume	75
Issue number	22
DOIs	https://doi.org/10.1063/1.125297
Publication status	Published - 29 Nov 1999

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

Two of the authors (H.B.L. and G.Z.Y.) wish to thank Dr. X. M. Ding for the AFM measurement and acknowledge the financial support for this work from the Center of SuperDiamond and Advanced Films, City University of Hong Kong. This work was in part supported by the National Natural Science Foundation of China, the Research Grants Council of Hong Kong, and the Strategic Research Grants of the City University of Hong Kong.

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RGC-funded

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@article{3ba3fb91382b4a749f4832f8932180b1,

title = "Morphology and microstructure of BaTiO3/SrTiO3 superlattices grown on SrTiO3 by laser molecular-beam epitaxy",

abstract = "The morphology and microstructure of BaTiO3/SrTiO3 (BTO/STO) superlattices grown epitaxially on STO (001) substrates by a computer-controlled laser molecular-beam epitaxy deposition system have been characterized by means of atomic force microscopy and high-resolution transmission electron microscopy (HRTEM). It is found that the HRTEM images taken along the [120] direction of BTO and STO show the maximal contrast difference. It is, therefore, observed that the superlattices consist of a highly oriented and single-crystalline multilayered structure. As identified by HRTEM, the number of unit cells in each BTO or STO layer matches very well with that obtained from reflection high-energy electron diffraction oscillations. The surfaces and interfaces of the superlattices are atomically smooth. In the superlattices, the ratio between the c axis of BTO and STO is about 4\% larger than that measured from BTO or STO bulk crystals. {\textcopyright} 1999 American Institute of Physics.",

author = "N. Wang and Lu, \{H. B.\} and Chen, \{W. Z.\} and T. Zhao and F. Chen and Peng, \{H. Y.\} and Lee, \{S. T.\} and Yang, \{G. Z.\}",

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T1 - Morphology and microstructure of BaTiO3/SrTiO3 superlattices grown on SrTiO3 by laser molecular-beam epitaxy

AU - Wang, N.

AU - Lu, H. B.

AU - Chen, W. Z.

AU - Zhao, T.

AU - Chen, F.

AU - Peng, H. Y.

AU - Lee, S. T.

AU - Yang, G. Z.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 1999/11/29

Y1 - 1999/11/29

N2 - The morphology and microstructure of BaTiO3/SrTiO3 (BTO/STO) superlattices grown epitaxially on STO (001) substrates by a computer-controlled laser molecular-beam epitaxy deposition system have been characterized by means of atomic force microscopy and high-resolution transmission electron microscopy (HRTEM). It is found that the HRTEM images taken along the [120] direction of BTO and STO show the maximal contrast difference. It is, therefore, observed that the superlattices consist of a highly oriented and single-crystalline multilayered structure. As identified by HRTEM, the number of unit cells in each BTO or STO layer matches very well with that obtained from reflection high-energy electron diffraction oscillations. The surfaces and interfaces of the superlattices are atomically smooth. In the superlattices, the ratio between the c axis of BTO and STO is about 4% larger than that measured from BTO or STO bulk crystals. © 1999 American Institute of Physics.

AB - The morphology and microstructure of BaTiO3/SrTiO3 (BTO/STO) superlattices grown epitaxially on STO (001) substrates by a computer-controlled laser molecular-beam epitaxy deposition system have been characterized by means of atomic force microscopy and high-resolution transmission electron microscopy (HRTEM). It is found that the HRTEM images taken along the [120] direction of BTO and STO show the maximal contrast difference. It is, therefore, observed that the superlattices consist of a highly oriented and single-crystalline multilayered structure. As identified by HRTEM, the number of unit cells in each BTO or STO layer matches very well with that obtained from reflection high-energy electron diffraction oscillations. The surfaces and interfaces of the superlattices are atomically smooth. In the superlattices, the ratio between the c axis of BTO and STO is about 4% larger than that measured from BTO or STO bulk crystals. © 1999 American Institute of Physics.

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JF - Applied Physics Letters

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