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电磁材料最新综述两篇
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1. 多铁性纳米复合材料界面中的磁电耦合效应 Magnetoelectric coupling across the interface of multiferroic nanocomposites Xiefei Yao, Jing Ma, Yuanhua Lin, Ce-wen Nan, Jinxing Zhang SCIENCE CHINA Materials, 2015, 58(2): 143-155 | doi:10.1007/s40843-015-0024-7 Abstract In recent decades, magnetoelectric effect in multiferroic materials has attracted extensive attention owing to the upcoming demands for new-generation multi-functional magnetoelectronic devices, such as transducer, sensor and so on. This gives people a strong push to explore the multiferroic materials with a reduced dimension and effective coupling between electric and magnetic orderings, especially at room temperature. Due to the weak magnetoelectric coupling strength in sing-phase multiferroic materials, scientists start to design nanocomposites and artificial nanostructures with strong coupling among order parameters (lattice, charge, spin and orbital). In this review, we will introduce recent major progresses of magnetoelectric coupling in multiferroic nanocomposites across their interfaces from the following four aspects: strain effect, charge transfer, magnetic exchange interaction and orbital hybridization, based on their coupling mechanisms. Through a full understanding of the above coupling among these orderings, it is possible to achieve the nanoscale modulation of magnetization (ferroelectric polarization) by external electric (magnetic) field. Apart from the magnetoelectric coupling, those artificially functional nanocomposites provide us a platform to explore and study the emerging physical phenomena so that we can design self-assembled nanostructures to tailor novel functionalities in future applications. 中文摘要 近几十年来, 人们对于下一代多功能磁电器件(例如换能器, 传感器等)的需求越来越高, 因此吸引了众多科学家探索与研究多铁性材料的磁电耦合效应, 在室温以及低维条件下寻求电与磁的强耦合. 由于单相多铁性材料的磁电耦合强度非常弱, 或者耦合温度远远低于室温, 科学家们开始设计和研究多铁性复合材料及其纳米结构. 本综述将从应力、电荷转移、磁交换作用, 以及轨道杂化四个方面介绍多铁性复合材料磁电效应的耦合机制. 通过充分了解这些序参量在磁电耦合效应中的作用, 我们能够成功实现纳米尺度下外电场(磁场)对磁性能(铁电性能)的调控. 此外, 这些人造多功能纳米复合材料也为设计自组装纳米结构以及将来实现多功能器件的应用提供了广阔的平台.  1.jpg 2. 钙钛矿型氧化物中氧八面体扭转对磁学和电学性能的调控 Tunable magnetic and electrical behaviors in perovskite oxides by oxygen octahedral tilting Ya Gao, Jianjun Wang, Liang Wu, Shanyong Bao, Yang Shen, Yuanhua Lin, Cewen Nan SCIENCE CHINA Materials, 2015, 58(4): 302-312 | doi:10.1007/s40843-015-0047-0 Abstract The oxides with perovskite structure possess abundant physical properties, such as magnetism, dielectricity, photoelectricity, ferroelectricity, etc. The oxygen ions in the perovskite unit cell constitute an octahedral distribution. The deformation or tilting of the special oxygen octahedra structure leads to new performances or properties change. Here, we give a review of the relationship between magnetic and electrical behaviors and oxygen octahedral tilting in several typical perovskite oxides. An understanding of how to tune these properties by controlling the tilting during the sample growth can more effectively guide the design of new structures for high performance and inspiring their potential applications. 中文摘要 钙钛矿结构氧化物具有极其多样化的物理性能, 如磁性、介电性、光电性、铁电性等. 钙钛矿晶胞中的氧离子排布成八面体结构. 氧八面体的变形或旋转会改变原有的物理特性, 甚至产生原本不存在的新性能. 本文综述了几种典型钙钛矿氧化物的氧八面体旋转与磁性能和电性能的关系, 同时探讨了如何通过样品制备控制微观的八面体旋转, 从而更有效的设计具有高性能的新结构, 及其潜在应用.  2.jpg |
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