Spin-Polarized Vacuum Tunneling Study

自旋极化真空隧道研究

• 批准号: 9023400
• 负责人: Robert Meservey
• 金额: $ 23.5万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-01 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9023400&HistoricalAwards=false
• 关键词: Spin; Polarized; Vacuum; Tunneling; Study

This project will combine spin-polarized tunneling methods with some of the techniques of scanning tunneling microscopy (STM) in an ultra high vacuum environment. The techniques will be applied to probe the surface magnetism of superconducting and magnetic materials. The research will include low temperature studies of spin-orbit and magnetic scattering in superconductors, magnetic impurities in normal metals, and tunneling measurements with oriented single-crystal ferromagnets. Part of the project will involve continued development of superconducting and ferromagnetic tips crucial to operation of STM and spin polarized tunneling SSTM apparatus. Ferromagnetic to ferromagnetic tunneling measurements will be made at temperatures up to 300 K with various materials and modulation techniques. The STM techniques will initially be used to position the tunneling tip at a proper site within tunneling distance. Later the limits of spatial resolution will be investigated in the study of individual impurities or antiferromagnets. These results will be compared with theory. It is expected that this study will give information leading to eventual design of a spin-sensitive tunneling microscope with close to atomic resolution.

该项目将联合收割机自旋极化隧道方法与 扫描隧道显微镜（STM）的一些技术， 超高真空环境。 这些技术将应用于 探测超导和磁性材料的表面磁性 材料. 这项研究将包括低温研究， 超导体中的自旋轨道和磁散射，磁 正常金属中的杂质，以及 定向单晶铁磁体。 该项目的一部分将 包括超导和铁磁的持续发展 扫描隧道显微镜和自旋极化隧道SSTM操作要点 设备. 铁磁-铁磁隧穿测量 将在高达300 K的温度下用各种材料制成， 调制技术 STM技术最初将用于 为了将隧道尖端定位在隧道内的适当位置， 距离 空间分辨率的极限将是 在单个杂质研究中进行了研究，或 反铁磁体 这些结果将与理论进行比较。 它 预计这项研究将提供信息， 最终设计的自旋敏感隧道显微镜， 原子分辨率。