石墨烯沟道全自旋逻辑器件开关特性  

Switching characteristics of all-spin logic devices based on graphene interconnects

作　　者：李成 蔡理[1] 王森[1] 刘保军 崔焕卿[1] 危波[1] 

机构地区：[1]空军工程大学理学院,西安710051 [2]空军工程大学第一航空学院,信阳464000

出　　处：《物理学报》2017年第20期262-269,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11405270);陕西省自然科学基础研究计划(批准号:2017JM6072;2014JQ8343)资助的课题~~

摘　　要：由于石墨烯的电导率相比典型的金属材料更大,自旋弛豫时间更长,自旋轨道相互作用更弱,从而在相同的注入电流情况下,自旋电流在石墨烯材料中的耗散作用更弱.基于自旋传输和磁化动力学耦合模型,研究了石墨烯沟道全自旋逻辑器件的开关特性.结果显示,在相同的电源电压下和器件尺寸下,石墨烯沟道材料的全自旋逻辑器件磁矩翻转时间比Cu沟道更短,流入输出纳磁体的自旋电流更大.同时,长度越短、宽度越窄的沟道其开关时间更短,功耗更小.在满足磁体磁矩翻转的临界开关电流的情况下,石墨烯沟道的可靠工作长度也显著大于Cu沟道.所以石墨烯材料是相比于金属材料更理想的沟道材料.另外,通过合理选择沟道尺寸,能进一步降低器件开关时间和功耗.上述结论为全自旋逻辑器件的优化设计与应用提供了理论参考.Traditional complementary metal-oxide-semiconductor（CMOS） technology has reached nanoscale and its physical limits are determined by atomic theory and quantum mechanics, which results in a series of problems such as deteriorated device reliability, large circuit interconnection delay, and huge static power dissipation. In the past decades, with the discovery of giant magnetoresistance effect and tunnel magnetoresistance effect, spintronics has become a research hotspot in this field. Specially, spin transfer torque effect has been experimentally verified that the magnetization of a ferromagnet layer can be manipulated using spin polarized current rather than an external magnetic field. Spintronics is a new type of electronics which utilizes spin rather than charge as state variable for electrical information processing and storage. As an example, all spin logic（ASL） devices, which stores information by using the magnetization direction of the nanomagnet and communication by using spin current, is generally thought to be a good post-CMOS candidate. Compared with the typical metal material, the graphene material has a large conductivity, long spin relaxation time, and weak spin-orbit interaction. Therefore, the dissipation of spin current in the graphene material is weaker than the counterpart in typical metal when the injected current is identical. In this paper, the switching characteristics of all spin logic device comprised of graphene interconnects are analyzed by using the coupled spin transport and magneto-dynamics model. The results show that comparing with ASL device comprised of copper interconnects, the magnetic moment reversal time of ASL with graphene interconnection is short and the spin current flows into the output magnet is large under the condition of same applied voltage and device size. Meanwhile, the switching delay and the energy dissipation are lower when the interconnects are shorter and narrower. When the critical switching current which is required for the magnetization reversal is

关 键 词：全自旋逻辑器件 石墨烯 沟道尺寸 开关特性 

分 类 号：TN60[电子电信—电路与系统]