Spin Transport and Dynamics in Ferromagnet-Semiconductor Structures
铁磁体半导体结构中的自旋输运和动力学
基本信息
- 批准号:0804244
- 负责人:
- 金额:$ 33.5万
- 依托单位:
- 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:
- 关键词:
项目摘要
TechnicalThis project will address the fundamental physics of spin transport and dynamics in hybrid ferrromagnet-semiconductor heterostructures. Devices in which large non-equilibrium spin populations are generated by spin injection will be fabricated, and the effects of spin polarization gradients on both charge and spin transport will be investigated. Mechanisms for spin transport will be probed by exploiting new spin-sensitive electrical detection techniques. Of particular interest are spin-orbit and hyperfine effects, which provide both new means for controlling electron spins as well as potential sources of spin relaxation. The project consists of three components. First, new devices will be developed allowing for the generation of polarization gradients on sub-micron length scales. Second, electrical measurements sensitive to spin dynamics will be used to investigate the coupling of spin and charge transport near the metal-insulator transition in GaAs and InxGa1-xAs. Finally, dynamic coupling between spins in the semiconductor and the ferromagnet will be investigated on nanosecond time scales.Non-technicalMagnetic materials such as iron, cobalt or nickel represent a cornerstone of data storage technologies, and they are also a critical component in sensors for a wide range of applications from cars to cardiac defibrillators. This project will explore the fundamental science of a new class of systems in which magnetic materials such as iron are combined with semiconductors. Graduate and undergraduate students will be trained in the nanofabrication and measurement techniques required to fabricate and study devices based on these materials. Recent research has shown that electrons can be transferred from ferromagnetic metals into semiconductors while preserving magnetic information in the form of their spin, which is analogous to a small magnet attached to the electron. This project will determine how magnetic information can be transported inside semiconductors and then read out electronically. New electronic devices combining very small magnets with thin layers of semiconductor will be developed. New frontiers in the development of extremely small (less than one micron) and fast (less than one billionth of a second) devices will be addressed. The output of this research will be useful in applications where storage and processing capabilities need to be combined in a single circuit element.
本计画将探讨铁磁-半导体异质结构中自旋输运与动力学的基础物理。 将制造由自旋注入产生大的非平衡自旋布居的器件,并研究自旋极化梯度对电荷和自旋输运的影响。 自旋输运机制将探索利用新的自旋敏感的电检测技术。 特别令人感兴趣的是自旋轨道和超精细效应,它们既提供了控制电子自旋的新手段,也提供了自旋弛豫的潜在来源。 该项目由三个部分组成。 首先,将开发允许在亚微米长度尺度上产生极化梯度的新设备。 第二,电测量敏感的自旋动力学将被用来调查附近的GaAs和InxGa 1-xAs的金属-绝缘体转变的自旋和电荷输运的耦合。 最后,半导体和铁磁体中自旋之间的动态耦合将在纳秒时间尺度上进行研究。非技术磁性材料,如铁,钴或镍代表了数据存储技术的基石,它们也是传感器的重要组成部分,用于从汽车到心脏起搏器的广泛应用。 该项目将探索一类新系统的基础科学,其中铁等磁性材料与半导体相结合。 研究生和本科生将接受纳米制造和测量技术的培训,以制造和研究基于这些材料的设备。 最近的研究表明,电子可以从铁磁金属转移到半导体中,同时以其自旋的形式保留磁性信息,这类似于一个小磁铁附着在电子上。该项目将确定磁性信息如何在半导体内部传输,然后以电子方式读出。 将开发出把非常小的磁铁和薄层半导体结合在一起的新的电子设备。 在极小(小于一微米)和快速(小于十亿分之一秒)设备的发展新的前沿将得到解决。 这项研究的结果将是有用的应用程序中的存储和处理能力需要结合在一个单一的电路元件。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Paul Crowell其他文献
Paul Crowell的其他文献
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{{ truncateString('Paul Crowell', 18)}}的其他基金
Spin Pumping in Ferromagnet-Semiconductor Heterostructures
铁磁体半导体异质结构中的自旋泵浦
- 批准号:
1708287 - 财政年份:2017
- 资助金额:
$ 33.5万 - 项目类别:
Continuing Grant
Time-Resolved Spin Dynamics in Ferromagnetic Microstructures
铁磁微结构中的时间分辨自旋动力学
- 批准号:
0406029 - 财政年份:2004
- 资助金额:
$ 33.5万 - 项目类别:
Continuing Grant
Acquisition of a Measurement System for Research and Education in Magnetic Heterostructures
获取用于磁性异质结构研究和教育的测量系统
- 批准号:
0113917 - 财政年份:2001
- 资助金额:
$ 33.5万 - 项目类别:
Standard Grant
CAREER: Quantum Critical Dynamics in Magnetic Systems
职业:磁系统中的量子临界动力学
- 批准号:
9983777 - 财政年份:2000
- 资助金额:
$ 33.5万 - 项目类别:
Continuing Grant
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