Magnetic Tunable Nanostructures: Property Characterization and Modeling

磁性可调谐纳米结构：特性表征和建模

• 批准号: 1031619
• 负责人: Lawrence Bennett
• 金额: $ 58.84万
• 依托单位: George Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1031619&HistoricalAwards=false
• 关键词: Magnetic; Tunable; Nanostructures; Property; Characterization

The objective of this research is to systematically determine the magnetic properties of nanoscaled ferromagnetic materials and to compare them to their coarse-grained counterparts for use as electronically tunable magnetic nanostructures. The research involves synthesis, processing, and characterization of their magnetic properties as a function of material variables and applied electric field. These results, complemented by modeling will provide a fundamental understanding of the effects of electric field, chemistry, and microstructure on the properties of magnetic tunable nanostructures. The synthesis involves an eight source molecular beam epitaxy and an eight-target DC/RF sputtering deposition systems, with in-situ characterization capabilities. Their magnetic properties (MS, MR, HC, Hb, and TC, First Order Reversal Curves, etc.) will be characterized using SQUID and SQUID VSM magnetometers, Lorentz microscopy, FMR, and Kerr Effect spectroscopy. The microstructural features will be examined by LEED, TEM, STEM, XRD, Lorentz and Mössbauer spectroscopies. The results will advance the understanding of these nanostructures and promote their technological applications. This is a German-American collaborative effort, involving the Institute of Nanotechnology, Karlsruhe, Germany with George Washington University, Washington, DC and the National Institute of Standards and Technology, Gaithersburg, MD.If successful, the results of this research are expected not only to promote the understanding of tunable nanostructures, but also impact the understanding of the magnetic behavior of the broader class of magnetic nanostructures that include tunnel junctions, quantum dots, and patterned media. Future efforts are expected to lead to tailoring and optimization of the properties of various magnetic nanostructures for their use in a wide range of technological applications, including magnetic data storage and sensor devices. Graduate and undergraduate students and post-doctoral fellows will benefit through acquiring comprehension in advanced experimental magnetic measurements and taking opportunities to exchange visits between the U.S. and Germany. This project is funded jointly by the Division of Civil, Mechanical, and Manufacturing Innovation and the Office of International Science and Engineering.

这项研究的目的是系统地确定纳米级铁磁材料的磁性，并将其与粗粒材料进行比较，以用作电子可调磁性纳米结构。 该研究涉及作为材料变量和外加电场函数的磁性的合成、处理和表征。 这些结果与建模相辅相成，将提供对电场、化学和微观结构对磁性可调谐纳米结构特性的影响的基本理解。 该合成涉及八源分子束外延和八靶 DC/RF 溅射沉积系统，具有原位表征功能。 它们的磁特性（MS、MR、HC、Hb 和 TC、一阶反转曲线等）将使用 SQUID 和 SQUID VSM 磁力计、洛伦兹显微镜、FMR 和克尔效应光谱进行表征。 微观结构特征将通过 LEED、TEM、STEM、XRD、洛伦兹和穆斯堡尔光谱进行检查。 研究结果将增进对这些纳米结构的理解并促进其技术应用。这是一项德美合作项目，涉及德国卡尔斯鲁厄纳米技术研究所、华盛顿特区乔治华盛顿大学和马里兰州盖瑟斯堡国家标准与技术研究所。如果成功，这项研究的结果不仅将促进对可调谐纳米结构的理解，还将影响对更广泛的磁性纳米结构的磁性行为的理解，包括 隧道结、量子点和图案介质。 未来的努力预计将导致各种磁性纳米结构的特性的定制和优化，以用于广泛的技术应用，包括磁性数据存储和传感器设备。 研究生、本科生和博士后将通过理解先进的实验磁测量以及利用美国和德国之间的互访机会而受益。 该项目由土木、机械和制造创新司和国际科学与工程办公室联合资助。