Magnetism of Molecule-based Thin Films, Nanoparticles, and Frustrated Systems

分子薄膜、纳米粒子和受阻系统的磁性

• 批准号: 0701400
• 负责人: Mark Meisel
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0701400&HistoricalAwards=false
• 关键词: Magnetism; Molecule; based; Thin; Films

Technical:This project focuses on the fabrication and characterization of the magnetism of molecule-based thin films, nanoparticles, and frustrated systems. Building upon previous work that discovered an anisotropic, photoinduced decrease in thin films consisting of Prussian blue analog materials, hetero-layered films and nanoparticles will be generated and studied. The new materials are expected to possess new magneto-optical functionality above 77 Kelvin. Frustration in two-dimensional triangular lattices possessing two magnetic exchange parameters will be studied by low temperature thermodynamic measurements, and the ratio of the couplings will be tuned by pressure and deuteration. The results will test the rich and diverse phase diagram that has been predicted and will investigate magnetic interactions mediated by hydrogen bonds. The research is interdisciplinary and international, involving physics-chemistry collaborations and coworkers at Safarik University, Kosice, Slovakia. The work is expected to require studies at national laboratories, including the National High Magnetic Field Laboratory in Tallahassee and the Spallation Neutron Source at Oak Ridge National Laboratory. Junior researchers, including high school, undergraduate, and graduate students, will participate in the research and will be trained to explore and model new magnetic phenomena possessing potential applications in magneto-optical recording devices and switches.Non-technical:This project studies the magnetism of new two-dimensional and nanoscopic systems. Due to the increase of competition between the microscopic magnetic spins embedded in the new structures, the dynamics of the magnetism is expected to evolve in ways not usually observed in larger magnets. These fundamental studies will provide a roadmap for the design and fabrication of new materials possessing magneto-optical functionality in a range of temperatures that makes them technologically useful. A blend of microscopic and macroscopic probes are used to explore the foundations of the magnetism, and national facilities, like the National High Magnetic Field Laboratory in Tallahassee and the Spallation Neutron Source at Oak Ridge National Laboratory, provide specialized resources needed for the investigations. The interdisciplary research involves a long-standing and productive physics-chemistry team and consists of an international collaboration with researchers at Safarik University, Kosice, Slovakia. High school, undergraduate, and graduate students participate and drive the efforts while receiving training on how to model and explore magnetic phenomena down to nanoscopic length scales. The research is expected to provide a roadmap for new technological developments of magneto-optical recording devices and switches.

技术：该项目重点关注基于分子的薄膜、纳米粒子和受挫系统的磁性的制造和表征。 之前的工作发现了由普鲁士蓝模拟材料、异质层薄膜和纳米颗粒组成的薄膜存在各向异性、光致减少现象，在此基础上，将生成并研究这些薄膜。 新材料预计将拥有 77 开尔文以上的新磁光功能。 将通过低温热力学测量来研究具有两个磁交换参数的二维三角晶格中的挫败，并且将通过压力和氘化来调整耦合比率。 结果将测试所预测的丰富多样的相图，并将研究由氢键介导的磁相互作用。 这项研究是跨学科和国际性的，涉及斯洛伐克科希策萨法里克大学的物理化学合作和同事。 这项工作预计需要在国家实验室进行研究，包括塔拉哈西国家高磁场实验室和橡树岭国家实验室散裂中子源。 包括高中生、本科生和研究生在内的初级研究人员将参与该研究，并接受培训以探索和模拟在磁光记录设备和开关中具有潜在应用的新磁现象。非技术性：该项目研究磁性新的二维和纳米系统。 由于嵌入新结构中的微观磁自旋之间的竞争增加，磁性动力学预计将以在较大磁体中通常观察不到的方式演变。 这些基础研究将为设计和制造在一定温度范围内具有磁光功能的新材料提供路线图，使其在技术上有用。 微观和宏观探针的混合用于探索磁性的基础，塔拉哈西国家高磁场实验室和橡树岭国家实验室散裂中子源等国家设施为研究提供了所需的专业资源。 跨学科研究涉及一个长期且富有成效的物理化学团队，并由与斯洛伐克科希策 Safarik 大学研究人员的国际合作组成。 高中生、本科生和研究生参与并推动这些努力，同时接受如何建模和探索纳米级长度尺度的磁现象的培训。 该研究预计将为磁光记录设备和开关的新技术发展提供路线图。