Materials World Network: Self-Assembled Nanocomposite Magnetoelectric Thin Films

材料世界网：自组装纳米复合磁电薄膜

• 批准号: 0603115
• 负责人: Nian Sun
• 金额: $ 18.8万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0603115&HistoricalAwards=false
• 关键词: Materials; World; Network; Self; Assembled

This Materials World Network (MWN) project is a combined effort to develop novel low-temperature wet-chemical processing methods for self-assembled magnetoelectric (ME) nanocomposite films having strong ME coupling. The magnetoelectric effect is defined as the variation of dielectric polarization under an applied magnetic field, or the presence of an induced magnetization under an external electric field. The ME effect and materials are rich in both fundamental sciences and potential applications such as electrically tunable magnetic microwave devices, ultra-sensitive magnetic field sensors, solid state transformers, etc. Compared to single phase ME materials, magnetoelectric composite materials with ferroelectric and ferrimagnetic/ ferromagnetic phases have the advantages of much stronger ME coupling and the capability of independent tuning of the properties of the ferroelectric phase and the ferromagnetic/ferrimagnetic phase. ME films are essential for applications in CMOS/BICMOS, or monolithic microwave integrated circuits (MMIC) technologies. However, most of the available methods for synthesizing ME composites are for bulk materials, and cannot be readily extended to thin films. Magnetoelectric coupling is typically weak in multilayered ME composite films, whereas in nanocomposite films having 3-dimensional coupled microstructures the ME coupling is much stronger. Up until now, there has been limited published work on ME nanocomposite films. This collaborative effort between the ferroelectric materials group in the National Laboratory of Solid State Microstructures at Nanjing University, China, and the groups in Center for Microwave Magnetic Materials and Integrated Circuits at Northeastern University constitutes a strong, synergistic pairing of strength on ME composite materials. The Nanjing group will develop a sol-gel wet chemical process for 3-D coupled ME nanocomposite films; while the Northeastern groups will develop a low-temperature spin-spray wet chemical process for 3-D coupled ME nanocomposite films. The Nanjing group will focus on the characterization of the ME effects at DC and sub-MHz frequencies; while the Northeastern groups will focus on the ME coupling at RF/microwave frequencies. In addition, the Northeastern groups will characterize the composites at different length scales with different techniques. Together the Nanjing group and the Northeastern groups will establish the understanding on the processing- structure-property relationship in wet-chemical synthesized ME nanocomposite films. The proposed collaboration between the National Laboratory of Solid State Microstructures and the Center for Microwave Magnetic Materials and Integrated Circuits will lead to great opportunities for utilizing ME films in CMOS/BICMOS, and MMIC technologies, as well as novel devices and functionalities not yet considered. At the same time, this MWN proposal will enable active participation of students and junior researchers in international research experiences. This award is co-funded by the East Asia-Pacific Program of the Office of International Science and Engineering.

该材料世界网络 (MWN) 项目是一项共同努力，旨在开发新型低温湿化学加工方法，用于具有强 ME 耦合的自组装磁电 (ME) 纳米复合材料薄膜。磁电效应定义为在施加磁场下电介质极化的变化，或在外部电场下存在感应磁化强度。磁电效应和材料具有丰富的基础科学和潜在应用，如电可调磁微波器件、超灵敏磁场传感器、固态变压器等。与单相磁电材料相比，具有铁电和亚铁磁/铁磁相具有更强的ME耦合以及能够独立调节铁电相和铁磁/亚铁磁相的特性的优点。 ME 薄膜对于 CMOS/BICMOS 或单片微波集成电路 (MMIC) 技术的应用至关重要。然而，大多数可用的 ME 复合材料合成方法都是针对块体材料，并且不能轻易扩展到薄膜。多层ME复合膜中的磁电耦合通常较弱，而在具有3维耦合微结构的纳米复合膜中，ME耦合则强得多。到目前为止，关于 ME 纳米复合材料薄膜的已发表的工作还很有限。南京大学固体微结构国家实验室铁电材料研究组与东北大学微波磁性材料与集成电路研究中心铁电材料研究组之间的合作，在ME复合材料方面形成了强大的协同优势。南京课题组将开发用于3D耦合ME纳米复合薄膜的溶胶-凝胶湿化学工艺； Northeastern 团队将开发一种用于 3D 耦合 ME 纳米复合材料薄膜的低温旋转喷雾湿化学工艺。南京小组将重点研究直流和亚兆赫频率下 ME 效应的表征；而东北小组将重点研究射频/微波频率下的 ME 耦合。此外，东北小组将采用不同的技术在不同的长度尺度上表征复合材料。南京课题组和东北课题组将共同建立对湿化学合成ME纳米复合薄膜的加工-结构-性能关系的理解。固体微结构国家实验室与微波磁性材料和集成电路中心之间拟议的合作将为在CMOS/BICMOS、MMIC技术以及尚未考虑的新颖器件和功能中使用ME薄膜​​带来巨大的机会。同时，MWN 的这一提案将使学生和初级研究人员积极参与国际研究经验。该奖项由国际科学与工程办公室东亚太平洋项目共同资助。