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.

这个材料世界网络（MWN）项目是一个共同努力，开发新的低温湿化学处理方法的自组装磁电（ME）纳米复合薄膜具有强ME耦合。磁电效应被定义为在外加磁场下电介质极化的变化，或者在外电场下存在感生磁化。ME效应和材料在基础科学和潜在应用方面都很丰富，如电调谐磁性微波器件、超灵敏磁场传感器、固态变压器等。与单相ME材料相比，铁电铁磁磁电复合材料铁磁相具有强得多的ME耦合的优点，并且能够独立地调节铁电相和铁磁相的性质。亚铁磁相ME薄膜对于CMOS/BICMOS或单片微波集成电路（MMIC）技术中的应用至关重要。然而，大多数用于合成ME复合材料的可用方法是用于块体材料，并且不能容易地扩展到薄膜。磁电耦合通常是弱的多层ME复合膜，而在纳米复合膜具有三维耦合的微结构的ME耦合强得多。到目前为止，已经有有限的出版工作ME纳米复合薄膜。中国南京大学固态微结构国家实验室的铁电材料小组与东北大学微波磁性材料和集成电路中心的小组之间的合作努力构成了ME复合材料的强大协同配对。南京组将开发用于3-D耦合ME纳米复合薄膜的溶胶-凝胶湿化学工艺;而东北组将开发用于3-D耦合ME纳米复合薄膜的低温旋转喷雾湿化学工艺。南京小组将专注于DC和亚MHz频率下的ME效应的表征;而东北小组将专注于RF/微波频率下的ME耦合。此外，东北大学的研究小组将采用不同的技术在不同的长度尺度上对复合材料进行表征。南京小组和东北小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。固态微结构国家实验室与微波磁性材料和集成电路中心之间的拟议合作将为在CMOS/BICMOS和MMIC技术中利用ME薄膜以及尚未考虑的新器件和功能带来巨大机会。与此同时，MWN的这一提议将使学生和初级研究人员能够积极参与国际研究经验。该奖项由国际科学与工程办公室的东亚太平洋计划共同资助。