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

abstracteccs - 0802214 j。本研究的目的是合成、表征和设计用于高效自旋注入的高自旋极化铁磁/有机界面，并使用有机半导体作为间隔材料制造横向自旋阀装置。该方法是合成和制造具有接近100%自旋极化的锰基半金属铁磁电极的器件。为了表征自旋注入电极的半金属性质，将采用两种独特的方法：二次谐波产生和隧道磁电阻，同时探测铁磁/有机界面的电子和磁性。智力优势：理想的半金属铁磁体应具有100%的自旋极化，可以作为自旋电子器件中最有效的自旋注入器。在实际设备中，接口可能与批量有很大的不同。特别是，界面磁性尚未得到充分的解决。此外，由于缺乏有效的实验工具，有机材料中的自旋扩散和退相干尚未得到系统的研究。这些主题是本研究的重点。半金属铁磁材料的合成和表征以及对有机材料中自旋依赖过程的基本认识的进展，无疑不仅丰富了我们对材料的认识，而且也有利于凝聚态物理和材料科学的其他学科。更广泛的影响：拟议的研究涉及自旋电子器件中的高效自旋注入，如记录磁头，非易失性存储器和发光器件。如果使用半金属铁磁注入器可以显著提高自旋注入效率，所制成的器件的性能将优于现有器件。高效率的设备可以大大节省能源，降低生产成本，这将对高科技产业和整个社会产生积极的影响。拟议的教育计划将使更多的妇女和代表性不足的少数民族参与研究，继续向当地初中和高中及其周围社区开展外展活动，并加强研究界与公众之间的信息交流。这些拟议的活动也将提高公众对？学生对科学的兴趣水平，鼓励即将进入大学的学生选择科学作为他们的职业。

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.