Microstructure and Properties of Well-Ordered Multiferroic Pb(Zr,Ti)O3/CoFe2O4 Nanocomposites
Microstructure and Properties of Well-Ordered Multiferroic Pb(Zr,Ti)O3/CoFe2O4 Nanocomposites
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DOI：
10.1021/nn9012934
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发表时间：
2010-02-01
期刊：
影响因子：
17.1
通讯作者：
Hesse, Dietrich
中科院分区：
文献类型：
--
作者：
Gao, Xingsen;Rodriguez, Brian J.;Hesse, Dietrich
采用脉冲激光沉积和纳米多孔阳极氧化铝膜掩模相结合的纳米薄膜技术制备了多种类型的多铁性纳米复合材料，即周期性有序的CoFe 2 O 4点和Pb（Zr，Ti）O3-/CoFe 2 O 4双层异质结构点。通过适当调整工艺参数，可以获得外延纳米点基复合材料。对于由Pb（Zr，Ti）O-3覆盖的CoFe 2 O 4纳米结构组成的复合材料，可以观察到由Pb（Zr，Ti）O-3层诱导的意外的面外磁易轴和均匀的微畴结构。压电响应力显微镜（PFM）测试的纳米复合材料表现出很强的压电信号，它们也显示磁场依赖的电容测量揭示的磁电耦合。
A nanofabrication technique combining pulsed laser deposition and a nanoporous anodic aluminum oxide membrane mask is being proposed to prepare various types of multiferroic nanocomposites, viz. periodically ordered CoFe2O4 dots covered by a continuous Pb(Zr,Ti)O-3 layer, Pb(Zr,Ti)O-3 dots covered with CoFe2O4, and Pb(Zr,Ti)O-3/CoFe2O4 bilayer heterostructure dots. By properly tuning the processing parameters, epitaxial nanodot-matrix composites can be obtained. For the composite consisting of CoFe2O4 nanostructures covered by a Pb(Zr,Ti)O-3 film, an unexpected out-of-plane magnetic easy axis induced by the top Pb(Zr,Ti)O-3 layer and a uniform microdomain structure can be observed. The nanocomposites tested by piezoresponse force microscopy (PFM) exhibit strong piezoelectric signals, and they also display magnetoelectric coupling revealed by magnetic-field dependent capacitance measurement.