Synthesis and characterization of half-metallic ferromagnetic oxides for organic semiconductor spintronic devices

有机半导体自旋电子器件用半金属铁磁氧化物的合成与表征

• 批准号: 0802214
• 负责人: Jing Shi
• 金额: $ 30万
• 依托单位: University of California-Riverside
• 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: 2008-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0802214&HistoricalAwards=false
• 关键词: Synthesis; characterization; half; metallic; ferromagnetic

AbstractECCS-0802214J. Shi, U of Cal RiversideThe objective of this research is to synthesize, characterize, and engineer high spin polarization ferromagnetic/organic interfaces for high-efficiency spin injection, and to fabricate lateral spin valve devices using organic semiconductors as spacer. The approach is to synthesize and fabricate devices with manganite-based half-metallic ferromagnetic electrodes which possess nearly 100% spin polarization. To characterize the half-metallic property of the spin injecting electrodes, two unique methods will be employed: second harmonic generation and tunneling magnetoresistance, both probing the electronic and magnetic properties of the ferromagnetic/organic interfaces.Intellectual merit: Ideal half-metallic ferromagnets should have 100% spin polarization, which can serve as the most efficient spin injector in spintronic devices. In real devices, the interface can significantly differ from the bulk. In particular, the interfacial magnetism has not yet been adequately addressed. In addition, spin diffusion and decoherence in organic materials have not been systematically studied for lacking effective experimental tools. These topics are the focus of this proposed research. Advances in synthesis and characterization of the half-metallic ferromagnetic materials and in fundamental understanding of the spin-dependent process in organic materials will not only undoubtedly enrich our knowledge of materials, but also benefit other disciplines of condensed matter physics and materials science.Broader impact: The proposed research is related to high-efficiency spin injection in spintronic devices such as recording heads, non-volatile memories, and light-emitting devices. If the spin injection efficiency is dramatically increased by using half-metallic ferromagnetic injectors, the resulting devices will perform superior to the existing devices. High-efficiency devices can lead to a significant saving in energy and a lower production cost, which will positively impact the high-technology industry and the society as a whole. The proposed education plan will involve more women and under-represented minorities in research, continue the outreach activities to local middle and high schools and the surrounding communities, and enhance information exchange between the research community and the general public. These proposed activities will also raise public?s interest level in science and encourage the college-bound students to choose science as their careers.

AbstractECCS-0802214J。这项研究的Cal Riversidethe的Shi，是为了合成，特征和工程的高自旋极化铁磁/有机接口，用于高效自旋注入，并使用有机半导体作为间隔器来制造侧向自旋阀装置。该方法是用基于锰矿的半金属铁磁电极合成和制造设备，具有近100％自旋极化。为了表征自旋注入电极的半金属特性，将采用两种独特的方法：第二次谐波生成和隧穿磁磁性，均探测铁电磁/有机界面的电子和磁性。智力优点：理想的半金属铁磁铁应该具有100％自旋极化，可以用作自旋装置中最有效的自旋注射器。在实际设备中，界面可能与整体明显不同。特别是，界面磁性尚未得到充分解决。此外，由于缺乏有效的实验工具，还没有系统地研究有机材料中的自旋扩散和变形。这些主题是这项拟议研究的重点。半金属铁磁材料的合成和表征的进步以及对有机材料中自旋依赖性过程的基本理解不仅将无疑会丰富我们对材料的了解，而且还会使凝聚态物理学和材料科学的其他学科受益。 ：拟议的研究与自旋设备（例如记录头，非挥发性记忆和发光设备）中的高效自旋注射有关。如果使用半金属铁磁喷射器通过使用自旋注入效率大大提高，则所得设备的性能将优于现有设备。高效率设备可以大大节省能源和较低的生产成本，这将对高科技行业和整个社会产生积极影响。拟议的教育计划将涉及更多妇女和代表性不足的少数群体，继续向当地中学和高中及周边社区进行外展活动，并增强研究界与公众之间的信息交流。这些拟议的活动还将提高公众在科学方面的兴趣水平，并鼓励大学学生选择科学作为职业。