物理学报2016，Vol.65Issue(11)：118501-1-118501-7,7.DOI:10.7498/aps.65.118501
功能化扶手椅型石墨烯纳米带异质结的磁器件特性∗
Magnetic device prop erties for a hetero junction based on functionalized armchair-edged graphene nanoribb ons
摘要
Abstract
Graphene is predicted to hold a promising use for developing future miniaturized electronic devices. However, the magnetic transport properties based on the armchair-edged graphene nanoribbons (AGNRs) is less studied in currently existing work. So in this work the special chemical modified nanoribbons based on the edge of the AGNR bridged by the transition metal Mn atom and passivated subsequently by two F atoms or two H atoms (AGNR-Mn-F2 or AGNR-Mn-H2) are proposed theoretically. Our calculations from first-principle method based on the spin-polarized density functional theory combined with the non-equilibrium Green’s function technique show that the heterojunction F2-AGNR-Mn-H2 consisting of such two types of nanoribbons possesses the excellent magnetic device features, namely, the spin polarization is able to reach almost 100% in a very large bias region, and under P magnetic configuration (the external magnetic fields applied perpendicularly to two electrodes are set to point to the same direction), the single spin filtering effects can be realized, while under the AP configuration (the external magnetic fields applied perpendicularly to two electrodes are set to point to the opposite directions), the dual spin filtering effects can be realized. It is also found that such a heterojunction features dual diode-like effect, and its rectification ratio is up to be 108. Additionally, changing the direction of switching magnetic field, namely, changing the magnetic configurations from one kind of case to another, would lead to an obvious spin valve effect, and the giant magnetoresistace approaches to 108%. These findings suggest that the excellent spin polarization, dual diode-like effect, and giant magnetoresistace effect can be realized simultaneously for this heterojunction, therefore, it holds good promise in developing spintronic devices.关键词
石墨烯纳米带异质结/自旋过滤效应/自旋二极管效应/巨磁阻效应Key words
graphene nanoribbon heterojunction/spin filter effect/spin diode-like effect/giant magne-toresistace effect引用本文复制引用
朱朕,李春先,张振华..功能化扶手椅型石墨烯纳米带异质结的磁器件特性∗[J].物理学报,2016,65(11):118501-1-118501-7,7.基金项目
国家自然科学基金(批准号:61371065,51302022)和湖南省自然科学基金(批准号:12JJ3004,14JJ2076,2015JJ3002,2015JJ2009,2015JJ2013)资助的课题.@@@@* Project supported by the National Natural Science Foundation of China (Grant Nos.61371065,51302022) and Hunan Provincial Natural Science Foundation of China (Grant Nos.12JJ3004,14JJ2076,2015JJ3002,2015JJ2009,2015JJ2013) （批准号:61371065,51302022）
