Materials World Network: Emergent Magnetism in Metal Nanocrystals

材料世界网络：金属纳米晶体中的新兴磁性

• 批准号: 0807065
• 负责人: Brian Korgel
• 金额: $ 36万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0807065&HistoricalAwards=false
• 关键词: Materials; World; Network; Emergent; Magnetism

This is a joint research project between The University of Texas at Austin (UT Austin) and the University of Alicante (UA) in Spain to study unexpected or emergent magnetism in metal nanocrystals. Magnetism has been observed in a variety of materials that are not expected to be magnetic, including the metal nanocrystals that will be studied in this research program. This research team will examine the underlying physics of emergent magnetic properties in gold and bismuth nanocrystals through a joint theoretical and experimental effort. The team at UT Austin will synthesize and measure the magnetic properties of gold and bismuth nanocrystals. The team at UA will perform model calculations of the electronic and magnetic properties of the nanocrystals, as well as experimental scanning tunneling spectroscopy (STS) and anisotropic magnetoresistance (AMR) measurements to measure the electronic properties of individual nanocrystals and to search for a definitive signature of ferromagnetism in these materials, if it exists. The whole group, including students and post-docs involved in the project, meets twice a month by videoconference to discuss the project. These regular group meetings provide students with a significant amount of interaction during the course of the project. In addition, students from UT Austin spend one month in Alicante every year, learning the theory and how the STS and AMR measurements are performed and, vice-versa, students from UA visit Austin for one month to learn about the nanocrystal synthesis and magnetic measurements. This international research program provides exposure to a combination of theory and experiment?both synthesis and property measurement?that offers students an outstanding training opportunity in interdisciplinary materials science and engineering. This research project also provides a unique and exciting environment for students to learn how to cooperate scientifically across political, social and geographical borders.

这是德克萨斯大学奥斯汀分校（UT Austin）和西班牙阿利坎特大学（UA）之间的联合研究项目，旨在研究金属纳米晶体中意外或突发的磁性。 在多种预计不具有磁性的材料中观察到磁性，包括本研究计划将研究的金属纳米晶体。 该研究小组将通过理论和实验的共同努力，研究金和铋纳米晶体中出现的磁性的基本物理原理。 德克萨斯大学奥斯汀分校的团队将合成并测量金和铋纳米晶体的磁性。 UA 团队将对纳米晶体的电子和磁性特性进行模型计算，以及实验扫描隧道光谱 (STS) 和各向异性磁阻 (AMR) 测量，以测量单个纳米晶体的电子特性并寻找明确的特征这些材料中的铁磁性（如果存在）。整个小组，包括参与该项目的学生和博士后，每月通过视频会议举行两次会议来讨论该项目。这些定期的小组会议为学生在项目过程中提供了大量的互动。此外，德克萨斯大学奥斯汀分校的学生每年在阿利坎特呆一个月，学习理论以及如何进行 STS 和 AMR 测量，反之亦然，来自 UA 的学生访问奥斯汀一个月，了解纳米晶体合成和磁性测量。 这个国际研究项目提供了理论与实验相结合的机会——合成和性能测量——为学生提供了跨学科材料科学与工程方面的绝佳培训机会。 该研究项目还为学生提供了一个独特且令人兴奋的环境，让他们学习如何跨越政治、社会和地理边界进行科学合作。