Spin-polarized Electron Tunneling with Ferromagnetic Materials

铁磁材料的自旋极化电子隧道

• 批准号: 9423013
• 负责人: Jagadeesh Moodera
• 金额: $ 25.5万
• 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: 1995
• 资助国家: 美国
• 起止时间: 1995-06-01 至 1998-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423013&HistoricalAwards=false
• 关键词: Spin; polarized; Electron; Tunneling; Ferromagnetic

9423013 Moodera Experimental investigation of the properties of magnetic materials by the surface-sensitive technique of spin-polarized tunneling is the aim of this research program. In particular, electron tunneling between ferromagnetic metals, through ferromagnetic insulators, and exchange effects in ultrathin films, and at the interfaces between ferromagnetic metals and paramagnetic metals will be studied. Planar tunnel junctions will use superconductors as electron-spin detectors at low temperature and voltage. Our recent success in using ferromagnetic metals as electron-spin detectors at room temperature and higher voltages greatly broadens this field of research and suggests technological uses. %%% Improvement of computer magnetic memory systems is currently of high priority. Study of surfaces and interfaces has become increasingly pertinent from the point of present and future technology. This is a proposal for the study of the physics of magnetic effects in thin film surfaces and trilayers using the technique of spin-polarized tunneling. The recently discovered large magnetoresistance effects in ferro-magnetic tunnel junctions at room temperature promise important applications for these effects in READ/WRITE sensors and memory elements. ***

9423013 Moodera通过自旋极化隧道的表面敏感技术对磁性材料的性质进行实验研究是本研究计划的目的。 特别是铁磁金属之间的电子隧穿，穿过铁磁绝缘体，以及交换效应 在 超薄 电影，并在 接口 铁磁金属和顺磁金属之间的关系将被研究。 平面隧道结将使用超导体作为电子自旋探测器， 低温和低电压。 我们最近成功地在室温和更高电压下使用铁磁金属作为电子自旋探测器，大大拓宽了这一研究领域，并提出了技术应用。 %计算机磁存储器系统的改进目前是高度优先的。 从现在和未来技术的角度来看，表面和界面的研究已经变得越来越相关。 这是对薄膜表面磁效应物理研究的一个建议 和 三层膜技术， 自旋极化隧穿 最近在铁磁隧道结中发现的室温下的大磁阻效应为这些效应在读/写传感器和存储元件中的重要应用提供了希望。 ***