A spin-valve device based on dumbbell-shaped graphene nanoislands

被引：35
|
作者：
Ma, Zhaoli [1 ]
Sheng, Weidong [1 ]
机构：
[1] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 08期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.3630229
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Electron transport in a graphene nanoisland with mixed edge profiles is studied by using the spin-unrestricted Hubbard model. The dumbbell-shaped device consists of two hexagonal nanoislands with zigzag edges connected by a armchair nanoribbon. Including the nearest-neighbor hopping and on-site Coulomb repulsion, the self-consistent calculation shows that two distinct ferromagnetic configurations allowed for the proposed device act like ON and OFF states for spin-polarized electrons. Furthermore, the spin-valve effect is demonstrated, as a proof of concept, in the device occupied by one ferromagnetic configuration without resorting to external magnetic or electric fields. (C) 2011 American Institute of Physics. [doi:10.1063/1.3630229]
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页数：3
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