Single Wall Carbon Nanotube Architectures for Molecular-Scale Spin Injection Devices

用于分子级自旋注入装置的单壁碳纳米管结构

• 批准号: 0400501
• 负责人: Manish Chhowalla
• 金额: $ 17.95万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0400501&HistoricalAwards=false
• 关键词: Single; Wall; Carbon; Nanotube; Architectures

In magnetoelectronics the spin of the charge carriers is exploited. In molecular electronics the circuits possess precision at the atomic level. We aim to integrate these two fields by fabricating heterostructure devices that will integrate half-metals (such as manganites) with single wall carbon nanotubes (SWNTs). The ferromagnetic manganites are a particularly effective source of spin-polarized electrons (polarization?100%). Carbon nanotubes display exotic properties (Kondo physics, Luttinger liquid behavior and superconducting fluctuations) that we will explore and exploit with spin polarized injection. Significantly, spin-injection will be across nanoscale interfaces. Therefore device performance could far exceed the performance of planar tunnel junctions in which the interfaces are imperfect and span several microns.The scientific merit of the proposed work arises firstly from its materials science impact. The in-situ growth of SWNT architectures has yet to be achieved. Secondly, the use of SWNTs as the non-ferromagnetic layer in the architecture offers intriguing possibilities arising from the fact that the SWNT-magnetic interface is brought down to molecular dimensions. This combined with the intrinsic one-dimensionality and extremely long elastic- and phase- scattering lengths of SWNTs allows progress towards a new generation of molecular-scale functional devices. The broader impact of this proposal is in the training and mentoring of graduate students, in particular minority and women students, to be future professionals. Another key is the continuing collaboration between NJIT and Rutgers, two public institutions with high (over 40%) percentage of underrepresented minority students. The continuing collaboration will provide more opportunities for training larger number of undergraduate and graduate students at both institutions and sharing of resources.

在磁电子学中，利用了载流子的自旋。在分子电子学中，电路具有原子级的精度。我们的目标是通过制造将半金属（例如锰酸盐）与单壁碳纳米管（SWNT）集成的异质结构器件来集成这两个领域。铁磁锰酸盐是自旋极化电子（极化？100%）的特别有效的来源。碳纳米管表现出奇异的特性（近藤物理、路廷格液体行为和超导波动），我们将通过自旋极化注入来探索和利用这些特性。值得注意的是，自旋注入将跨越纳米级界面。因此，器件性能可能远远超过界面不完美且跨越数微米的平面隧道结的性能。这项工作的科学价值首先来自于其材料科学影响。 SWNT 结构的原位生长尚未实现。其次，在结构中使用单壁碳纳米管作为非铁磁层提供了有趣的可能性，因为单壁碳纳米管-磁性界面被降低到分子尺寸。这与单壁碳纳米管固有的一维性和极长的弹性和相位散射长度相结合，使得新一代分子级功能器件取得了进展。该提案的更广泛影响在于培训和指导研究生，特别是少数族裔和女学生，使其成为未来的专业人士。另一个关键是 NJIT 和罗格斯大学之间的持续合作，这两个公立机构的少数族裔学生比例很高（超过 40%）。持续的合作将为双方院校培养更多本科生和研究生以及资源共享提供更多机会。