使用脉冲激光沉积技术,在(001)取向的LaAlO3(LAO)单晶基片上外延生长了BaTiO3/La2/3Sr1/3MnO3(BTO/LSMO)双层复合薄膜.电学和磁学性能的研究显示复合薄膜具有较低的相对介电常数(εr=263),优良的铁电和铁磁性能以及高于室温的铁磁居里温度(Tc=317 K).复合薄膜的磁电电压系数(αE)为176 mV/A,高于同类结构磁电系统一个数量级,相应的界面耦合系数k值为0.68,表明铁磁层和铁电层界面之间存在较大程度的耦合.%Using pulsed laser deposition technique, the multiferroic BaTiO3/La2/3Sr1/3MnO3 composite bilayer films were epitaxially prepared on (001) oriented LaAlO3 single crystal substrate. The measurements of electric and magnetic properties showed that the composite structure possessed superior ferromagnetic and ferroelectric properties, its relative dielectric constant and ferromagnetic curie temperature were 263 and 317 K, respectively. The magnetoelectric voltage coefficient for the bilayer films at room temperature was around 176 mV/A, which was at least one order of magnitude higher than the previous reported in the same structures. The corresponding interface coupling parameter k was about 0.68, which indicated a better interface coupling between ferromagnetic and ferroelectric layers.
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