CAREER: Achieving Tunable Nanomagnetism using Charge Defects and Strain

职业：利用电荷缺陷和应变实现可调谐纳米磁性

• 批准号: 1255584
• 负责人: Pushpa Raghani
• 金额: $ 42.7万
• 依托单位: Boise State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1255584&HistoricalAwards=false
• 关键词: CAREER; Achieving; Tunable; Nanomagnetism; using

TECHNICAL SUMMARYThis CAREER award supports theoretical and computation research, education, and outreach activities on magnetism in nanomaterials. The PI will investigate mechanisms that control magnetism at the nanoscale. For practical applications, nanostructures are often deposited on a substrate, and nanostructure-substrate interactions are known to affect the magnetic properties of the substrate. Very recently, it was observed that transition metal nanostructures deposited at defect sites such as vacancies in the substrate, become effectively charged, which leads to the modification of their electronic properties and enhanced catalytic activity. The PI will investigate the effects of nanostructure charging on their magnetic properties using methods based on Density Functional Theory. The PI aims to focus on ultrathin insulating films, such as copper nitride and sodium chloride, supported by metallic substrates. The first objective is to establish electronic and magnetic properties of ultrathin insulating films in the presence of various kinds of defects and to determine the stability of various charge states of the defects. The second objective is to determine the stability of various charge states of nanostructures deposited on these defect sites and, their effect on the nanostructure-substrate coupling and the magnetic properties of nanostructures. An aim of the research is to develop correlations between magnetic properties of nanostructures and their charge and the nanostructure-substrate coupling. This would contribute to enabling the design nanostructures with desired electronic and magnetic properties.This award also supports educational activities. Involving undergraduate students in research is the primary focus of the education component of this proposal. Undergraduate and graduate students will have the opportunity to take part in industrial internships and work with PI's industrial collaborators. Promoting science education at the secondary-school level is the next crucial component of this CAREER award. To achieve this goal, high-school student interns will be recruited during summer to work with the PI. The PI will also deliver talks on the role of computational physics in nanoscience and nanotechnology at local Boise schools and at the Discovery Center of Idaho located in Boise area. To promote enrollment of women undergraduates in sciences, meetings with women undergraduate students at Boise State will be organized periodically. Undergraduate students will develop awareness in materials modeling to discover and design new materials using theoretical and computational approaches.NONTECHNICAL SUMMARYThis CAREER award supports theoretical and computation research, education, and outreach activities on magnetism in nanomaterials. Continual miniaturization of devices has enabled many modern day technological advances from smart phones and tablets to high-density data storage on hard disks. The miniaturization of devices, however, has reached a point where further reduction in size requires studying materials at the nanoscale, that is, materials with a size some 10,000 times smaller than the thickness of a human hair. Each atom in a nanomaterial can behave like a tiny magnet which can be manipulated to develop novel devices that are not only smaller in size but also consume less power. Creating novel spintronic devices largely depends on the ability to tailor the properties of materials at nanoscale. The PI aims to use computational tools to develop methods to tune or control the magnetic properties of materials at the. This research contributes to efforts to develop techniques for designing tailor-made nanomagnets and to accelerate the search for new magnetic materials with desired properties at nanoscale. This award also supports educational activities. Involving undergraduate students in research is the primary focus of the education component of this proposal. Undergraduate and graduate students will have the opportunity to take part in industrial internships and work with PI's industrial collaborators. Promoting science education at the secondary-school level is the next crucial component of this CAREER award. To achieve this goal, high-school student interns will be recruited during summer to work with the PI. The PI will also deliver talks on the role of computational physics in nanoscience and nanotechnology at local Boise schools and at the Discovery Center of Idaho located in Boise area. To promote enrollment of women undergraduates in sciences, meetings with women undergraduate students at Boise State will be organized periodically. Undergraduate students will develop awareness in materials modeling to discover and design new materials using theoretical and computational approaches.

该职业奖支持纳米材料磁性的理论和计算研究，教育和推广活动。PI将研究在纳米尺度上控制磁性的机制。对于实际应用，纳米结构通常沉积在基底上，并且已知纳米结构-基底相互作用会影响基底的磁性。最近，人们观察到，过渡金属纳米结构沉积在缺陷位点，如在基板中的空位，成为有效的充电，这导致其电子性质的修改和增强的催化活性。PI将使用基于密度泛函理论的方法研究纳米结构充电对其磁性的影响。PI的目标是专注于由金属衬底支撑的绝缘膜，如氮化铜和氯化钠。第一个目标是建立在各种缺陷的存在下的绝缘薄膜的电子和磁性，并确定各种电荷状态的缺陷的稳定性。第二个目标是确定沉积在这些缺陷位点上的纳米结构的各种电荷状态的稳定性，以及它们对纳米结构-基底耦合和纳米结构的磁性的影响。本研究的目的是发展纳米结构的磁性与其电荷之间的相关性以及纳米结构与基底之间的耦合。这将有助于使纳米结构的设计具有所需的电子和磁性。该奖项还支持教育活动。让本科生参与研究是本提案教育部分的主要重点。本科生和研究生将有机会参加工业实习，并与PI的工业合作者一起工作。促进中学科学教育是该职业奖的下一个关键组成部分。为了实现这一目标，高中生实习生将在夏季招募与PI一起工作。PI还将在当地博伊西学校和位于博伊西地区的爱达荷州发现中心就计算物理在纳米科学和纳米技术中的作用进行会谈。为了促进理科女大学生的入学，将定期组织与博伊西州女大学生的会议。本科生将培养材料建模的意识，使用理论和计算方法发现和设计新材料。非技术总结这个职业奖支持纳米材料磁性的理论和计算研究，教育和推广活动。 设备的持续小型化已经实现了从智能手机和平板电脑到硬盘上的高密度数据存储的许多现代技术进步。然而，设备的小型化已经达到了一个程度，进一步减小尺寸需要研究纳米级的材料，即尺寸比人类头发厚度小10，000倍的材料。纳米材料中的每个原子都可以像一个微小的磁铁一样工作，可以操纵它来开发新的设备，不仅尺寸更小，而且功耗更低。制造新型自旋电子器件在很大程度上取决于在纳米尺度上定制材料特性的能力。PI的目标是使用计算工具来开发调整或控制材料磁性的方法。这项研究有助于开发设计定制纳米磁体的技术，并加速寻找具有纳米级所需性能的新磁性材料。 该奖项还支持教育活动。让本科生参与研究是本提案教育部分的主要重点。本科生和研究生将有机会参加工业实习，并与PI的工业合作者一起工作。促进中学科学教育是该职业奖的下一个关键组成部分。为了实现这一目标，高中生实习生将在夏季招募与PI一起工作。PI还将在当地博伊西学校和位于博伊西地区的爱达荷州发现中心就计算物理在纳米科学和纳米技术中的作用进行会谈。为了促进理科女大学生的入学，将定期组织与博伊西州女大学生的会议。本科生将培养材料建模的意识，使用理论和计算方法发现和设计新材料。