基于分子自旋阀的自旋电子学  

Spintronic study based on molecular spin valves

作　　者：谷现荣 郭立丹 秦阳 孙向南[1,2] Xianrong Gu;Lidan Guo;Yang Qin;Xiangnan Sun(Key Laboratory of Nonosyxtem ad Hieranohical Fabrication, Center for Excellence in Nanscience of Chinese Aeademy of Sclencex, National Center for Nanosclence and Tecbnology, Beijing 100190, Ching;School of Nanoscience and Technology. University of Chinese Academy of Seiences, Belling 100049. China;Departmeat of Materials Seience and Engineering,College of New Energy and Materias, China University of Perolenm Beljing, Beijing 102249,China)

机构地区：[1]国家纳米科学中心,中国科学院纳米系统与多级次制造重点实验室,中国科学院纳米科学卓越创新中心,北京100190 [2]中国科学院大学纳米科学技术学院,北京100049 [3]中国石油大学(北京)新能源与材料学院,材料科学与工程系,北京102249

出　　处：《科学通报》2018年第35期3689-3696,共8页Chinese Science Bulletin

基　　金：国家自然科学基金(21673059);国家重点研发计划“纳米科技”重点专项(2017YFA0206600,2016YFA0200700);中国科学院科研仪器设备研制项目(YJKYYQ20170037);中国科学院率先行动“百人计划”资助.

摘　　要：分子半导体材料因具有很长的自旋弛豫时间,被认为在自旋电子学领域存在巨大的应用潜力.在基于分子半导体材料开展的自旋电子学研究被首次报道后的十余年里,以分子自旋阀为载体的自旋电子学研究取得了巨大发展并引起了广泛关注.本文将围绕分子自旋阀中的自旋注入、界面效应和输运等关键研究方向,综述近年来该研究领域的重要研究成果,具体包括:分子自旋阀制备工艺改善、结构优化对自旋注入效率的提升,自旋界面效应对优化注入和调控信号等方面的最新进展;以及分子半导体中自旋输运距离优化和输运机制研究结果.最后,基于分子自旋阀中的注入、界面效应和输运的研究基础,展望分子自旋阀多功能化这一新兴研究方向的发展前景.以上进展对未来自旋电子学和分子电子学领域进一步交叉研究的开展具有借鉴价值.Because of their extremely weak spin-orbit coupling and hence very long spin relaxation time,molecular semiconductors have considered to be very promising materials in spintronics.Since the first observation of spin transport in molecular semiconductors in 2002,molecular spintronics,as an emerging subject for studying spin-correlated phenomenon of electrons in molecular matrix,has attracted considerable research interests in the previous decade. Molecular spin valve is the most prototypical device in molecular spintronic,which should be the best test bed to study spintronic processes in molecules,including spin injection,spinterfacial effect,spin transport,as well as nov- el spintronic functions.Thus,to achieve highly reproducible molecular spin valves with high performances is of significant importance to the field of molecular spintronics,in which the efficient spin injection-transport process is the necessary precondition.However,according to current studies,there are several unexpected challenges for enhancing spin injection in spin valves,such as top electrode diffusion into molecular layer during device fabrication and the bad energy level alignment between ferromagnetic electrodes and molecules.To get away from these prob- lems and improve device performance,considerable contributions have already been made to enhance spin injection from perspective of creating novel fabrication methods,optimizing device structure as well as various interfacial engineering methods.Besides,the spinterfacial effects at the interface between ferromagnetic electrodes and molecules are also considered to be crucial for spin injection.In latest studies,hybridized interface state (HIS)was pro- posed to characterize interaction between ferromagnetic electrode and the first molecular layer,and its spin-density of state at Fermi level of ferromagnetic electrode was changed.Therefore,spin polarization was influenced;as well its electronic structure at HIS was rebuilt to affect spin injection.In this review,research advances regarding

关 键 词：分子自旋阀 分子半导体材料 自旋注入 自旋界面效应 自旋输运 

分 类 号：TN304[电子电信—物理电子学]