中文摘要：

本文采用脉冲激光沉积（PLD）方法,在NdGaO3（110）衬底上制备出了由钙钛矿锰氧化物材料La0.7Sr0.3MnO3和正铁氧体材料SmFeO3构成的高质量外延超晶格.在这一超晶格体系中,固定层数不变,当La0.7Sr0.3MnO3层厚度大于SmFeO3层的厚度时,超晶格的晶格逐渐发生弛豫,反之,则与衬底很好地共格.此外,伴随着这种应变状态的改变,超晶格的磁转变温度TC逐步增加,易磁化轴发生转变.我们认为这种应力状态以及磁性质的改变来源于强正交性的SmFeO3与菱形La0.7Sr0.3MnO3中氧八面体的界面耦合.

英文摘要：

Perovskite manganite La0. 7 Sr0. 3 MnO3/orthoferrite SmFeO3 superlattices with high epitaxial quality have been synthesized on NdGaO3 （110） substrates by the pulsed laser deposition technique. In these samples, we/ix the layer numbers, when the thickness of the La0. 7 Sr0. 3 MnO3 is greater than the SmFeO3 layer, the crystal lattice of the superlattices gradually relaxes, and otherwise they are well coherently grown on the substrates. In addition, the magnetization easy axis and magnetic transition temperature of the superlattices are altered with the changing of strain states. The results indicate that the strain states and magnetic properties are associated with the interracial octahedral connectivity coupling between orthorhombic SmFeO3 and rhombohedral La0. 7 Sr0. 3 MnO3.