有机复合磁电阻器件的制备、界面耦合作用与自旋输运研究

项目名称： 有机复合磁电阻器件的制备、界面耦合作用与自旋输运研究

项目编号： No.51471046

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 张宪民

作者单位： 东北大学

项目金额： 80万元

中文摘要： 目前报道的有机复合磁电阻器件中有机半导体层主要是非晶态结构，有机层存在大量缺陷降低了载流子活性，并引起自旋翻转，导致了有机复合磁电阻现象多数在低温下观察到，室温磁电阻比值非常低。有机单晶具有结构上的有序性、高的载流子迁移率和良好的热稳定性等特性。本项目拟通过在磁性单晶衬底上生长特定晶体取向有机层（有机单晶或具有高度织构化多晶）半导体薄膜，研制在室温下具有高磁电阻比值的自旋电子学材料与器件。系统研究不同晶向有机材料与不同晶向磁性材料的相互作用和磁硬化等新物理现象，揭示磁性层/有机晶体层界面耦合的机理以及与晶体取向的内在联系。通过对不同器件中的自旋输运效应（GMR、TMR 等）的分析，理解自旋电子在特定晶体取向有机分子层中的输运特点、探索自旋电子在有机晶体层中注入或隧穿的高效通道和降低输运过程中自旋翻转的有效方法，为获得下一代高性能的有机晶体复合磁电阻器件提供理论和实验基础。

中文关键词： 磁性材料；有机电子器件；磁电阻器件；自旋电子学

英文摘要： The organic layers used in the present organic hybrid devices are most of an amorphours structure. A large amount of defects in these amorphous layers reduce the carriers mobility and induce spin flip. As a result,the phenomenons of organic hybrid magnetoresistance are mostly observed at low temperature,and the magnetoresistance ratios reported at room temperature are very low. Organic single crystals have some advantages,such as ordered structure、high carrier mobility and highly thermal stability. This project will grow organic layer with special crystal orientations (organic single crystal or polycrystalline with highly ordered texture) on magnetic single crystal substrates, and then develop spin electronic materials and magnetoresistance devices with high magnetoresistance ratio at room temperature. Based on the systemic investigation of the interactions between organic layer and magnetic substrates with different orientations,and new physical phenomenon,such as magnetic hardening, the correlation and mechanism of interface coupling between the magnetic layer and the organic crystal layer will be explored. By the measurement of different devices (GMR, TMR, etc.), the spin dependent transport behaviors in the organic layers with different crystal orientations can be studied and understood. Effective channels and methods for the enhancement of spin injection/tunnelling and the decrease of spin flip in the organic layers will be investigated. This project will provide the fundamental knowledge in both theory and experiment to develop organically crystal hybrid magnetoresistance devives with high performance for next generation applications.

英文关键词： Magnetic material;organic electrinic devices;magnetoresistance device;spintronics