Magnetoelectric effect in multiferroic heteroepitaxial BaTiO3-NiFe2O4 composite thin films
Magnetoelectric effect in multiferroic heteroepitaxial BaTiO3-NiFe2O4 composite thin films
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DOI：
10.1016/j.actamat.2007.10.004
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发表时间：
2008-02-01
期刊：
影响因子：
9.4
通讯作者：
Nan, Ce-Wen
中科院分区：
文献类型：
--
作者：
Deng, Chaoyong;Zhang, Yi;Nan, Ce-Wen
采用脉冲激光沉积法在（111）-SrTiO 3单晶衬底上外延生长了NiFe 2 O 4-BaTiO 3异质结构复合薄膜，其中BaTiO 3层为柱状结构，NiFe 2 O 4层为连续薄膜。X射线衍射和电子显微镜的结构表征表明，无论沉积顺序如何，（111）取向的BaTiO 3和（111）取向的NiFe 2 O 4在（111）-SrTiO 3上都具有良好的水平异质结构。这种异质结构在室温下同时具有强的铁电和铁磁响应。特别地，在异质结构薄膜中观察到明显的直接磁电耦合效应。BaTiO 3和NiFe 2 O 4层在衬底上的生长顺序对复合薄膜的多铁性行为有影响。(c)2007 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Heterostructured NiFe2O4-BaTiO3 Composite thin films epitaxially grown on (111)-SrTiO3 single-crystal substrate were prepared using pulsed-laser deposition, where the BaTiO3 layer grew as columnar structure while the NiFe2O4 layer formed a continuous film. Structural characterization by X-ray diffraction and electron microscopy showed good horizontal heterostructures of (111)-oriented BaTiO3 and (111)-oriented NiFe2O4 on (111)-SrTiO3 whatever their deposition sequences. Such heterostructures present simultaneously strong ferroelectric and ferromagnetic responses at room temperature. In particular, an obvious direct magnetoelectric coupling effect was observed in the heterostructured films. The growth sequence of the BaTiO3 and NiFe2O4 layers on the substrate has an effect on multiferroic behavior of the composite thin films. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.