Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
Spin-X Institute, School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou 511442, China.
Mater Horiz. 2023 Apr 3;10(4):1060-1086. doi: 10.1039/d2mh01527g.
Interfaces in complex oxides give rise to fascinating new physical phenomena arising from the interconnected spin, lattice, charge and orbital degrees of freedom. Most commonly, interfaces are engineered in epitaxial superlattice films. Of growing interest also are epitaxial vertically aligned nanocomposite films where interfaces form by self-assembly. These two thin film forms offer different capabilities for materials tuning and have been explored largely separately from one another. Ferroics (ferroelectric, ferromagnetic, multiferroic) are among the most fascinating phenomena to be manipulated using interface effects. Hence, in this review we compare and contrast the ferroic properties that arise in these two different film forms, highlighting exemplary materials combinations which demonstrate novel, enhanced and/or emergent ferroic functionalities. We discuss the origins of the observed functionalities and propose where knowledge can be translated from one materials form to another, to potentially produce new functionalities. Finally, for the two different film forms we present a perspective on underexplored/emerging research directions.
界面在复杂氧化物中产生了引人入胜的新物理现象，这些现象源于相互关联的自旋、晶格、电荷和轨道自由度。最常见的是，通过外延超晶格薄膜来设计界面。同样引起关注的还有外延垂直排列的纳米复合材料薄膜，其中界面通过自组装形成。这两种薄膜形式为材料调谐提供了不同的能力，并且彼此之间在很大程度上是分开探索的。铁电体（铁电体、铁磁体、多铁体）是通过界面效应来操纵的最引人入胜的现象之一。因此，在这篇综述中，我们比较和对比了这两种不同薄膜形式中出现的铁电性质，突出了展示新的、增强的和/或新兴铁电功能的典型材料组合。我们讨论了观察到的功能的起源，并提出了可以将知识从一种材料形式转化为另一种形式的地方，以产生新的功能。最后，对于这两种不同的薄膜形式，我们提出了对探索不足/新兴研究方向的看法。
