Magnetic Transition Metal Nanowires

该奖项由2009年美国复苏和再投资法案(公法111-5)资助。非-技术描述：纳米磁学是科学中最活跃的领域之一，涉及广泛的基础科学问题和新兴技术。许多磁性设备仍处于初级阶段，彻底了解底层材料和电子性能及其对设备性能的影响将是未来技术的关键。该提案探索了新型磁性纳米线的重要潜在结构、磁性和传输特性。这项研究将解决纳米尺度的纳米线合成和磁性的基本问题，并在纳米科学的重要领域培养本科生和研究生。技术细节：该提案探索过渡金属氧化物和核壳金属/氧化物纳米线(NWS)的潜在结构、磁性和传输特性。采用化学气相沉积法(CVD)生长纳米晶，得到不同相和核壳结构的单晶纳米晶。这项研究最初将侧重于了解过渡金属及其氧化物的原子核的生长和结构性质，以及各种核壳结构的形成。这将包括对磁性过渡金属(铬、锰、铁、钴和镍)及其氧化物的CVD NW生长的综述，重点是了解和控制相的形成、形核和形态。这项研究将包括使用先进的电子和X射线表征技术对NWS进行全面的结构和磁性表征。该提案的后半部分将侧重于将这些纳米粒子集成到自旋传输设备中，以阐明纳米级复合材料的磁性，并确定它们在新设备应用中的潜力。这项研究将解决一类新的金属氧化物复合纳米粒子的基本问题，确定它们对未来技术的影响，并在材料合成、利用国家用户设备进行材料表征以及新材料在纳米技术中的应用方面培训本科生和研究生。

0906957FullertonThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).NON-TECHNICAL DESCRIPTION: Nanomagnetism is one of the most active areas in science with a wide range of fundamental scientific problems as well as emerging technologies. Many magnetic devices are still in their infancy and a thorough understanding of the underlying materials and electronic properties and their effect on device performance will be essential for future technologies. The proposal explores important underlying structural, magnetic, and transport properties of new class of magnetic nanowires. This research will address fundamental issues of nanowire synthesis and magnetism at the nanoscale and train undergraduate and graduate students in important areas of nanoscienceTECHNICAL DETAILS: The proposal explores underlying structural, magnetic, and transport properties of transition-metal oxide and core-shell metal/oxide nanowires (NWs). The NWs will be grown by chemical vapor deposition (CVD) resulting in single-crystal NWs of various phases and core-shell structures. The research will initially focus on understanding the growth and structural properties of NWs of transition metals and their oxides, and the formation of various core-shell structures. This will include a survey the CVD NW growth of the magnetic transition metals (Cr, Mn, Fe, Co and Ni) and their oxides with particular focus on understanding and controlling the phase formation, nucleation, and morphology. The research will include full structural and magnetic characterization of the NWs using advance electron and x-ray characterization techniques. The latter part of the proposal will focus on integrating these NWs into spin-transport devices to elucidate magnetic properties of composite materials at the nanoscale and to determine their potential for novel device applications. This research will address fundamental issues of a new class of metal-oxide composite NWs, determine their impact on future technologies, and train undergraduate and graduate students in materials synthesis, exploiting national user facilities for materials characterization, and the application of new materials to nanotechnology.