Reflection-based Spintronics

基于反射的自旋电子学

• 批准号: 0820880
• 负责人: Casey Miller
• 金额: $ 31.2万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0820880&HistoricalAwards=false
• 关键词: Reflection; based; Spintronics

The objective of this research is to engineer thin film spintronic devices based on a dynamic magnetic proximity effect. A non-zero spin-polarization will be induced in a non-magnetic material by reflection of conduction electrons off the interface of an insulating magnetic material. The approach is to fabricate non-magnetic-conductor/magnetic-insulator structures completely in situ, then probe the resulting spin-polarized current via three complementary techniques: tunneling magnetoresistance, tunneling spin polarization, and x-ray magnetic circular dichroism. Trilayer device structures with independently addressable magnetic layers will also be explored.Intellectual Merit: This project may spearhead a paradigm shift for all-electrical spintronics. Present efforts focus on injecting spins from ferromagnets into non-magnetic materials. However, spin-injection has crippled progress, particularly for semiconductor-based devices. The proposed devices induce a spin-polarization in a non-magnetic conduction channel by reflection off an insulating magnetic gate, thereby obviating the difficulties of injection. This project will develop the building blocks for a series of more complex device architectures able to deliver electrically tunable spin-polarized currents.Broader Impacts: This transformational research may ease the integration of spintronics with existing back-end semiconductor processing, thereby substantially reducing barriers to commercial spintronics. This program integrates teaching and multidisciplinary training of undergraduate and graduate students, including those from under-represented groups, by unifying physics, engineering, and materials concepts, and by developing hands-on spintronics experiments for high school and undergraduate laboratories. This work enhances infrastructure via a new collaboration between the University of South Florida and the Advanced Light Source.

这项研究的目的是基于动态磁接近效应来设计薄膜旋转器设备。 通过反射传导电子从绝缘磁性材料的界面反射传导电子，将在非磁性材料中诱导非零自旋偏振。 该方法是通过三种互补技术完全原位地制造非磁导体/磁性绝缘体结构，然后通过三种互补技术探测所得的自旋偏振电流：隧穿磁力磁力，隧穿自旋极化和X射线磁磁圆形二色dichroism。具有独立地寻址磁层的三层设备结构也将被探索。智能优点：该项目可能会为全电动旋转型机构带来范式移动。 目前的努力集中在将铁磁体的旋转注入非磁性材料中。 但是，旋转注射的进度瘫痪了，特别是对于半导体的设备。 所提出的设备通过反射绝缘磁门诱导非磁性传导通道中的自旋极化，从而避免了注射的困难。 该项目将开发一系列更复杂的设备体系结构的构建块，能够提供电气可调的自旋偏振电流。Broader的影响：这项转换性研究可能会使Spintronics与现有的后端半导体处理的整合，从而大大减少了商业纺纱剂的障碍。该计划通过统一物理，工程和材料概念以及通过开发高中和本科实验室的动手亲身亲身生动的实验，整合了本科和研究生的教学和多学科培训，包括来自代表性不足的群体的教学和培训。 这项工作通过南佛罗里达大学和高级光源之间的新合作来增强基础设施。