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：该项目的重点是基于分子的薄膜，纳米颗粒和受挫系统的磁性的制造和表征。 在先前的工作基础上，发现了由普鲁士蓝类似物材料组成的薄膜中的各向异性光致减少，将生成和研究异质层膜和纳米颗粒。 新材料有望在77开尔文以上具有新的磁光功能。 具有两个磁交换参数的二维三角晶格中的挫挫将通过低温热力学测量来研究，并且耦合的比率将通过压力和氘来调谐。 这些结果将测试已经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。 该研究是跨学科和国际性的，涉及斯洛伐克科希策Safarik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，包括塔拉哈西的国家高磁场实验室和橡树岭国家实验室的Spiral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研究，并将接受培训，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：本项目研究新的二维和纳米系统的磁性。 由于嵌入新结构中的微观磁自旋之间的竞争增加，预计磁性的动力学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被用来探索磁性的基础，国家设施，如塔拉哈西的国家高磁场实验室和橡树岭国家实验室的Spectron中子源，为调查提供所需的专业资源。 跨学科研究涉及一个长期和富有成效的物理化学团队，并与斯洛伐克科希策Safarik大学的研究人员进行国际合作。 高中，本科和研究生参与并推动努力，同时接受如何建模和探索纳米尺度的磁现象的培训。 该研究有望为磁光记录器件和开关的新技术发展提供路线图。