Atomic study of Fe3O4/SrTiO3 Interface
Atomic study of Fe3O4/SrTiO3 Interface
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DOI：
10.1017/s143192761500728x
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发表时间：
2015-08
影响因子：
2.8
通讯作者：
D. Gilks;D. Kepaptsoglou;K. McKenna;L. Lari;Q. Ramasse;K. Matsuzaki;T. Susaki;V. Lazarov
中科院分区：
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作者：
D. Gilks;D. Kepaptsoglou;K. McKenna;L. Lari;Q. Ramasse;K. Matsuzaki;T. Susaki;V. Lazarov
复合氧化物异质结构由于其丰富的物理性质而对开发新的功能材料感兴趣[1]。许多氧化物是绝缘体，但也是宽带隙半导体、超导体、离子导体、亚铁磁和反铁磁材料。因此，氧化物异质结构为具有多功能特性的器件提供了广阔的平台。这些器件的功能在很大程度上取决于多层异质结构界面上的原子尺度结构和电子不连续性;因此需要对它们的性质进行原子尺度的理解。在这项工作中，我们专注于尖晶石钙钛矿异质结构，有潜力的发展多铁性器件使用Fe 3 O 4 /StTiO 3作为模型系统[2，3]。这种异质结构对于自旋电子学应用是重要的，但它也代表了一类可以通过合适的界面工程耦合的亚铁磁和铁电性质的异质结构。采用脉冲激光沉积技术在SrTiO 3（STO）衬底上制备了Fe 3 O 4薄膜.为了改善薄膜的结构和化学计量比，进行了后退火。用X射线衍射法测定了薄膜的总体结构。用扫描透射电子显微镜和电子能量损失谱仪对Fe 3 O 4 / StTiO 3界面进行了原子和电子研究，
Complex oxide heterostructures are of interest for developing new functional materials due to their rich physical properties [1]. Many oxides are insulators, but also wide band gap semiconductors, superconductor, ionic conductors, ferrimagnetic and antiferromagnetic materials. Hence oxide heterostructures provide a broad platform for devices with multifunctional properties. The functionality of those devices strongly depends on the atomic scale structural and electronic discontinuities across the multilayer heterostructural interfaces; therefore the need for atomic scale understanding of their properties. In this work we focus on spinel-perovskite heterostructures that have potential for the development of multiferroic devices by using Fe 3 O 4 /StTiO 3 as a model system [2,3]. This heterostructure is of importance for spintronic applications but also it represents a class of heterostructure that can host ferrimagnetic and ferroelectric properties which can be coupled through suitable interface engineering. The Fe 3 O 4 films were grown on SrTiO 3 (STO) substrate by pulse laser deposition techniques. A post-annealing has been undertaken in order to improve films structure and stoichiometry The overall structure of the films was determined by X-Ray diffractometry. Atomic and electronic study of the Fe 3 O 4 / StTiO 3 interface was performed using scanning transmission electron microscopy and electron energy loss spectroscopy with a JEOL 2200 FS TEM/STEM and