Characterization of the Magnetic Distortions in Closed-Circuit Magnetic Measurements

*****技术摘要*****本奖项根据2009年美国复苏和再投资法案（公法111-5）资助。开路测量中第一象限和第三象限磁滞回线的畸变由Weiss于1926年报道并命名为？图像效果吗?。这种畸变在20世纪60年代开发的闭路测量中直到2008年才被该小组报道，表明磁滞畸变与饱和磁化强度和铁磁样品的几何形状有关。本研究将探讨这种畸变，并对铁磁材料之间的界面相互作用有一个基本的了解。将分析各种因素，包括铁磁样品和电磁极的饱和磁化强度和几何形状，以及施加在样品上的压力。实际测量和计算机软件都将用于分析铁磁材料之间的相互作用。这项研究提供了一个重新审视韦斯的机会？这对于加强科学研究的基础设施和开发先进的现代技术，准确识别用于可再生能源的高性能发电机/电动机的新磁性材料具有重要意义。这个项目为青年科学家提供了一个极好的训练场所；例如，研究生和博士后。*****非技术摘要*****本奖项由2009年美国复苏与再投资法案（公法111-5）资助。科学家和工业界都依赖磁滞图。用于表征永磁材料的闭环测量，被认为不存在与开路测量相关的误差。然而，该研究小组在2008年发表的两份报告表明，这种磁滞畸变存在于闭环测量中，并且在施加磁场时与样品材料的磁场强度和几何形状有关。磁滞畸变使新磁性材料的识别和开发复杂化。只有全面了解这一现象，才能帮助建立有效的校正方法，这对于加强科学研究的基础设施和开发先进的现代技术，准确识别用于可再生能源的高性能发电机/电机的新型磁性材料具有重要意义。本项目将使用磁测量和计算机建模来研究磁滞失真，并对这一现象进行基本的理解，并开发新的磁表征设备。这个项目为青年科学家提供了一个极好的训练场所；例如，研究生和博士后。

***** Technical Abstract *****This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Distortion of the magnetic hysteresis loop in first and third quadrants in open-circuit measurements was reported by Weiss in 1926 and named ?image effect?. Such distortion was not reported in the closed-circuit measurements developed in 1960s until 2008 by this group, showing the hysteresis distortion to be linked with the saturation magnetization and the geometry of the ferromagnetic specimens. This research will investigate the distortion and develop a fundamental understanding of the interfacial interactions between ferromagnetic materials. Various factors, including the saturation magnetization and geometry of the ferromagnetic specimens and electromagnetic poles, as well as the pressure applied to the specimens, will be analyzed. Both actual measurements and computer software will be used to analyze the interactions between the ferromagnetic materials. This research provides a chance to revisit Weiss?s magnetic theory for new discoveries, which is important for infrastructure enhancement in scientific research and for development of advanced modern technology to accurately identify new magnetic materials for high-performance generators / motors for renewable energy. The project provides an excellent training ground for young scientists; e.g., graduate students and post-docs. ***** Non-Technical Abstract *****This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Both scientists and industry rely on magnetic ?hysteresigraphs? in closed-circuit measurements to characterize permanent magnetic materials, which are considered to be free from errors associated with open-circuit measurements. However, two reports published in 2008 by this research group show that such magnetic hysteresis distortion exist in closed-circuit measurements and is linked to the magnetic strength and geometry of the specimen materials when a magnetic field is applied. The hysteresis distortion complicates identifying and developing new magnetic materials. Only a comprehensive understanding of the phenomenon can help to establish effective correction methods, which is important for infrastructure enhancement in scientific research and for development of advanced modern technology to accurately identify new magnetic materials for high-performance generators / motors for renewable energy. This project will use both magnetic measurements and computer modeling to investigate the magnetic hysteresis distortion and develop fundamental understanding of the phenomenon, and develop new devices for magnetic characterization. The project provides an excellent training ground for young scientists; e.g., graduate students and post-docs.