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使用脉冲激光沉积技术,在LaAlO3(001)单晶基片上制备了La2/3Sr1/3MnO3(LSMO)/BaTiO3(BTO)双层薄膜.X射线衍射分析显示,LSMO层和BTO层呈现纯(001)取向.原子力显微镜研究表明,薄膜表面晶粒大小均匀,排列致密,表面均方根粗糙度为1.4nm.复合薄膜的磁学、电学性能研究表明,其具有良好的磁学和介电性能.电输运测试显示,与在BTO层上施加正方向直流电压相比,当在BTO层上施加负方向直流电压时,LSMO表面层的电阻率变低,金属绝缘体相变温度TMI变高,亦即引起了LSMO层磁性的变化.这表明LSMO中磁学序参量和BTO中的电学序参量之间存在着耦合,即发生了由直流电场诱发的电致磁电效应.
The La2 / 3Sr1 / 3MnO3 (LSMO) / BaTiO3 (BTO) bilayer films were prepared on LaAlO3 (001) single crystal substrate by pulsed laser deposition.X-ray diffraction analysis showed that the LSMO and BTO layers exhibited pure (001) The results of atomic force microscopy showed that the grain size of the film surface is uniform and compact, and the root mean square roughness of the film surface is 1.4nm. The magnetic and electrical properties of the composite film show that it has good magnetic and dielectric properties. Transport tests showed that the resistivity of the LSMO surface layer became lower and the metal insulator transition temperature TMI became higher when a negative DC voltage was applied to the BTO layer than when a positive DC voltage was applied to the BTO layer, Which caused the magnetic change of the LSMO layer.This indicates that there is coupling between the magnetic parameter in LSMO and the electrical parameter in BTO, that is, the electromagnetism effect induced by DC electric field has occurred.