Microstructure, vertical strain control and tunable functionalities in self-assembled, vertically aligned nanocomposite thin films
Microstructure, vertical strain control and tunable functionalities in self-assembled, vertically aligned nanocomposite thin films
复制标题
DOI：
10.1016/j.actamat.2012.09.072
复制
发表时间：
2013-05-01
期刊：
影响因子：
9.4
通讯作者：
Wang, Haiyan
中科院分区：
文献类型：
--
作者：
Chen, Aiping;Bi, Zhenxing;Wang, Haiyan
垂直取向纳米复合氧化物薄膜由于其新颖的结构、垂直界面应变控制和可调的材料功能而引起了人们的极大兴趣。在这项工作中，货车薄膜的生长机制进行了研究，通过改变复合材料系统，两个组成相的比例，薄膜的生长条件，包括沉积温度和氧气压力以及生长速率。它已被证明，热力学参数，弹性和界面能和多相比在所得的微观结构中起主导作用。此外，在BiFeO3（BFO）和La0.7Sr0.3MnO3（LSMO）基货车薄膜系统中观察到了垂直界面应变，垂直应变可以通过生长参数和选择合适的第二相来调节。BFO：Sm2O3货车的介电损耗和LSMO基货车系统的低场磁电阻等物理性能的可调谐性已被证明。这些物理性质的增强和可调谐性归因于独特的货车结构和垂直应变控制。这些结果表明，货车架构与新颖的微结构和独特的垂直应变调谐可以提供一个通用的路线剪裁和操纵氧化物薄膜的功能。(c)2012 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Vertically aligned nanocomposite (VAN) oxide thin films have recently stimulated a significant amount of research interest owing to their novel architecture, vertical interfacial strain control and tunable material functionalities. In this work, the growth mechanisms of VAN thin films have been investigated by varying the composite material system, the ratio of the two constituent phases, and the thin film growth conditions including deposition temperature and oxygen pressure as well as growth rate. It has been shown that thermodynamic parameters, elastic and interfacial energies and the multiple phase ratio play dominant roles in the resulting microstructure. In addition, vertical interfacial strain has been observed in BiFeO3 (BFO)- and La0.7Sr0.3MnO3 (LSMO)-based VAN thin film systems; the vertical strain could be tuned by the growth parameters and selection of a suitable secondary phase. The tunability of physical properties such as dielectric loss in BFO:Sm2O3 VAN and low-field magnetoresistance in LSMO-based VAN systems has been demonstrated. The enhancement and tunability of those physical properties have been attributed to the unique VAN architecture and vertical strain control. These results suggest that VAN architecture with novel microstructure and unique vertical strain tuning could provide a general route for tailoring and manipulating the functionalities of oxide thin films. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.