GOALI: Nanocrystalline Oxides For Integrated, Soft Magnetic Applications

GOALI：用于集成软磁应用的纳米晶氧化物

• 批准号: 0203785
• 负责人: David Clarke
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2007-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0203785&HistoricalAwards=false
• 关键词: GOALI; Nanocrystalline; Oxides; Integrated; Soft

The scientific goal of the program is to learn how to manipulate the magnetic coupling between nanocrystalline particles to create soft magnetic materials in which the bulk magnetic properties, such as permeability in field, magnetization and coercive losses can be independently varied. In monolithic materials these properties are not independent. The approach being taken is to synthesize nanocrystalline magnetic oxide particles and manipulate their packing into a bulk material to alter, through composition, particle size, shape and volume fraction, the inter-particle magnetic coupling. Initially, nano-particles of ferrites and rare-earth oxides are being synthesized using inverse micelle processes and their spacing and packing varied through the choice of surfactants and solvents to form bulk material compatible with use in electrical power converters and related devices. The materials are characterized at different stages to determine how the bulk magnetic properties are related to the properties of the nanocrystalline particles and their magnetic coupling.The overall justification of the program is to assess the potential for nanocrystalline-based materials in replacing existing magnetic materials in dc-dc electrical power converters by enhancing their performance and decreasing their physical size. Power converters are used throughout the electronics industry to provide a stable, low voltage power supply to almost all-digital electronics and microprocessors. Increasing demands for smaller, higher power, higher frequency dc-dc converters can only be realized with the development of magnetic materials having improved permeability and lower magnetic losses. The challenge being addressed is how to create new magnetic materials, using nanocrystalline particles, which can be fabricated into an integrated and functional power-converter whilst preserving their novel combination of magnetic properties. The collaboration with Rockwell Scientific Company provides students with experience in the design of the magnetic components of power devices as well as the opportunity to test their candidate materials as they are being developed.

该程序的科学目标是学习如何操纵纳米晶颗粒之间的磁耦合，以创建软磁性材料，在该材料中，诸如磁场，磁化和强制性损失的大量磁性特性可以独立变化。在整体材料中，这些特性并非独立。 所采用的方法是合成纳米晶磁氧化物颗粒并操纵其包装到散装材料中，以通过组成，粒径，形状和体积分数（粒子间磁耦合）改变。 最初，使用反胶束过程及其间距和填料合成的铁氧体和稀土氧化物的纳米粒子因选择表面活性剂和溶剂而变化，以形成与电力转换器和相关设备一起使用的大量材料。这些材料在不同阶段进行表征，以确定块状磁性与纳米晶颗粒及其磁耦合的性质如何相关。 DC-DC电力转换器通过增强其性能并降低其物理尺寸。电力转换器在整个电子行业都用于为几乎全数字电子和微处理器提供稳定的低压电源。 对较小，较高频率，较高频率DC-DC转换器的需求增加只能通过具有提高渗透性和较低磁性损耗的磁性材料的发展来实现。面临的挑战是如何使用纳米晶体颗粒来创建新的磁性材料，该颗粒可以在保留其新颖的磁性组合的同时，将其制成成综合和功能的功率连接器。 与Rockwell Scientific Company的合作为学生提供了电源设备磁性组件的设计经验，以及在开发候选材料时测试其候选材料的机会。