CAREER: Magnetic Domain Imaging in Nanostructured Ferromagnets

职业：纳米结构铁磁体的磁域成像

• 批准号: 9984181
• 负责人: Andrew Gavrin
• 金额: $ 23.69万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-10-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9984181&HistoricalAwards=false
• 关键词: CAREER; Magnetic; Domain; Imaging; Nanostructured

This is a CAREER project is devoted to the development of a technique known as the High Resolution Bitter Method (HRBM), and its application to the study of ferromagnetism in nanostructured materials. The colloidal ferrofluids used classically in the HRBM method will be replaced by sputtering or evaporation of magnetic material into an inert atmosphere to produce nanometer-sized particles. The particles are deposited on magnetic materials and aggregate along domain walls thus allowing a visualization of the domains. A scanning electron microscope (SEM) used to image the colloidially decorated materials. The new technique will be applied to the study of ferromagnetic granular solids which exhibit Giant Magneto Resistance (GMR). The nature of the domains, unexpectedly observed in GMR materials, is poorly understood. the HRBM will also be used to study nonuniformities that occur in the preparation of the commercially important NdFeB hard magnetic materials. A thorough understanding of the process leading to nonuniformities may lead to improvements in the properties of these materials. The educational component of this project involves the development and dissemination of the Just-in-Time Teaching system. This is a novel pedagogical tool that includes the use of the web to deliver preparatory assignments that students answer just before each class. The students' responses are then used by faculty for lecture preparation and as a basis for classroom discussion. This leads to an effective and enhanced interaction between students and teacher.%%%This is a CAREER project devoted to the study of magnetic materials, and to development of new teaching methods. The magnetic research component will develop and refine a new method to spray a coating of nanometer sized magnetic particles on to magnetic materials. The small particles aggregate along grain boundaries in these materials, providing a means to visualize and map these domains. The project will investigate magnetic materials such as the Giant Magneto Resistive (GMR) materials found in the magnetic recording applications, as well as the commercially important high-strength neodymium-iron-boron hard magnets. The educational component involves development of the Just-in-Time Teaching system techniques. This novel pedagogical tool includes the use of the world wide web to deliver preparatory assignments that students answer just before each class. The students' responses are then used by faculty for lecture preparation and as a basis for classroom discussion. This leads to an effective and enhanced interaction between students and teacher.

这是一个CAREER项目，致力于开发一种称为高分辨率Bitter方法（HRBM）的技术，及其在纳米结构材料铁磁性研究中的应用。HRBM方法中传统使用的胶体铁磁流体将被溅射或蒸发磁性材料到惰性气氛中以产生纳米尺寸的颗粒所取代。颗粒沉积在磁性材料上并沿沿着畴壁聚集，从而允许畴的可视化。扫描电子显微镜（SEM）用于对胶体装饰材料进行成像。新技术将被应用于铁磁颗粒固体的研究，表现出巨磁阻（GMR）。在GMR材料中意外观察到的域的性质知之甚少。HRBM还将用于研究在商业上重要的NdFeB硬磁材料的制备中出现的不均匀性。对导致非均匀性的过程的透彻理解可能会导致这些材料的性能的改善。该项目的教育部分涉及及时教学系统的开发和传播。这是一种新颖的教学工具，包括使用网络来交付学生在每堂课之前回答的预备作业。学生的反应，然后由教师用于讲座准备，并作为课堂讨论的基础。这将导致学生和教师之间的有效和增强的互动。%这是一个职业项目，致力于磁性材料的研究，并开发新的教学方法。磁性研究部门将开发和改进一种新的方法，将纳米尺寸的磁性颗粒涂层喷涂到磁性材料上。这些小颗粒沿着这些材料中的晶界聚集，提供了一种可视化和映射这些域的方法。该项目将研究磁性材料，如磁记录应用中发现的巨磁阻（GMR）材料，以及商业上重要的高强度钕铁硼硬磁体。教育部分涉及及时教学系统技术的发展。这种新颖的教学工具包括使用万维网来交付学生在每堂课之前回答的预备作业。学生的反应，然后由教师用于讲座准备，并作为课堂讨论的基础。这导致了学生和教师之间的有效和增强的互动。