Suppression of spin polarization in graphene nanoribbons by edge defects and impurities

被引：177

作者：

Huang, Bing ^{[1
]}

Liu, Feng ^{[2
]}

Wu, Jian ^{[1
]}

Gu, Bing-Lin ^{[1
]}

Duan, Wenhui ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[2] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.77.153411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the effect of edge defects (vacancies) and impurities (substitutional dopants) on the robustness of spin polarization in graphene nanoribbons (GNRs) with zigzag edges by using density-functional-theory calculations. The stability of the spin state and its magnetic moments is found to continuously decrease with increasing the concentration of the defects or impurities. The system generally becomes nonmagnetic at the concentration of one edge defect (impurity) per similar to 10 angstrom. The spin suppression is shown to be caused by the reduction and removal of edge states at the Fermi energy. Our analysis implies an important criterion on the GNR samples for spintronics applications.

引用

页数：4

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