中文摘要：

采用脉冲激光沉积方法，通过调节激光能量、激光频率、衬底温度、氧压、靶基距等工艺参数，在（100）取向的铝酸镧单晶衬底上制备出Bi0．8Ba0．2FeO3／La0．7Sr0．3MnO3多铁性异质结．X射线衍射图谱表明薄膜呈钙钛矿结构，高分辨透射电镜图谱和能量色散X射线图谱表明两相界面清晰且具有良好的匹配度，异质结呈f001）取向性生长．加场冷却条件下不同温度的磁滞回线（M-H）测量结果表明样品具有明显的交换偏置效应，交换偏置场（HEB）随温度的线性变化可能与异质结界面处电子轨道的重构和界面处自旋、轨道自由度之间的复杂的相互作用有关．

英文摘要：

Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3 multiferroic heterostructures are successfully synthesized on single crystal LaAlO3 （100） substrates by pulsed laser deposition via adjusting the parameters of laser energy, laser frequency, substrate temperature, oxygen pressure, distance between substrate and target, etc. The pure phase with perovskite structure is confirmed by the X-ray diffraction measurements. Using high-resolution transmission electron microscopy and energy dispersive X-Ray spectroscopy, we find that all the layers show preferential （00/） orientation, suggesting the epitaxial growth of the multilayered structure. Isothermal （7 K） M-H curves measured on sample after cooling the sample under ±1 T fields reveal a shift in M-H loop. The strong temperature dependence of HEB is likely to be directly related to an electronic orbital reconstruction at the interface and complex interplay between orbital and spin degrees of freedom.