Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

doi:10.1088/1674-1056/21/1/017203

中国物理B ›› 2012, Vol. 21 ›› Issue (1): 17203-017203.doi: 10.1088/1674-1056/21/1/017203

Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

田宏玉, 汪军

Department of Physics, Southeast University, Nanjing 210096, China

收稿日期:2011-05-17 修回日期:2011-09-01 出版日期:2012-01-15 发布日期:2012-01-20
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 110704032 and 110704033), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2010416), and the National Basic Research Program of China (Grant No. 2009CB

Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

Tian Hong-Yu(田宏玉)^† and Wang Jun(汪军)^‡

Department of Physics, Southeast University, Nanjing 210096, China

Received:2011-05-17 Revised:2011-09-01 Online:2012-01-15 Published:2012-01-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 110704032 and 110704033), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2010416), and the National Basic Research Program of China (Grant No. 2009CB

摘要/Abstract

摘要： We investigate the spin-dependent electron transport in single and double normal/ferromagnetic/normal zigzag graphene nanoribbon (NG/FG/NG) junctions. The ferromagnetism in the FG region originates from the spontaneous magnetization of the zigzag graphene nanoribbon. It is shown that when the zigzag-chain number of the ribbon is even and only a single transverse mode is actived, the single NG/FG/NG junction can act as a spin polarizer and/or a spin analyzer because of the valley selection rule and the spin-exchange field in the FG, while the double NG/FG/NG/FG/NG junction exhibits a quantum switching effect, in which the on and the off states switch rapidly by varying the cross angle between two FG magnetizations. Our findings may shed light on the application of magnetized graphene nanoribbons to spintronics devices.

关键词: spontaneous magnetization, zigzag graphene nanoribbon, spin polarizer, quantum switching effect

Abstract: We investigate the spin-dependent electron transport in single and double normal/ferromagnetic/normal zigzag graphene nanoribbon (NG/FG/NG) junctions. The ferromagnetism in the FG region originates from the spontaneous magnetization of the zigzag graphene nanoribbon. It is shown that when the zigzag-chain number of the ribbon is even and only a single transverse mode is actived, the single NG/FG/NG junction can act as a spin polarizer and/or a spin analyzer because of the valley selection rule and the spin-exchange field in the FG, while the double NG/FG/NG/FG/NG junction exhibits a quantum switching effect, in which the on and the off states switch rapidly by varying the cross angle between two FG magnetizations. Our findings may shed light on the application of magnetized graphene nanoribbons to spintronics devices.

Key words: spontaneous magnetization, zigzag graphene nanoribbon, spin polarizer, quantum switching effect

中图分类号: (Theory of electronic transport; scattering mechanisms)

72.10.-d

74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions) 73.23.-b (Electronic transport in mesoscopic systems)

田宏玉, 汪军. Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction[J]. 中国物理B, 2012, 21(1): 17203-017203.

Tian Hong-Yu(田宏玉) and Wang Jun(汪军) . Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction[J]. Chin. Phys. B, 2012, 21(1): 17203-017203.

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Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

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