期刊
ACS NANO
卷 4, 期 2, 页码 1099-1107出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn9012934
关键词
multiferroics; AAO template; nanodot array; magnetoelectric coupling; nanocomposite
类别
资金
- Alexander von Humboldt Foundation
- German Science Foundation (DFG) [SFB 762]
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.
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