中国物理B ›› 2012, Vol. 21 ›› Issue (1): 17305-017305.doi: 10.1088/1674-1056/21/1/017305

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Spin-dependent transport induced by magnetization in zigzag graphene nanoribbons coupled to one-dimensional leads

赵华, 张小伟, 蔡托, 桑田, 刘晓春, 刘芳   

  1. Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China
  • 收稿日期:2011-08-04 修回日期:2011-08-28 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 No. 11064010) and the Project of Qiannan Normal College for Nationalities, China (Grant No. QNSY201012).

Spin-dependent transport induced by magnetization in zigzag graphene nanoribbons coupled to one-dimensional leads

Zhao Hua(赵华)†, Zhang Xiao-Wei(张小伟), Cai Tuo(蔡托) Sang Tian(桑田), Liu Xiao-Chun(刘晓春), and Liu Fang(刘芳)   

  1. Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China
  • Received:2011-08-04 Revised:2011-08-28 Online:2012-01-15 Published:2012-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11064010) and the Project of Qiannan Normal College for Nationalities, China (Grant No. QNSY201012).

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摘要： We study spin transport in a zigzag graphene nanoribbon sample with two ferromagnetic strips deposited on the two sides of the ribbon. A tight-binding Hamiltonian was adopted to describe the sample connected to two one-dimensional leads. Our theoretical study shows that the resonance peaks of conductance for the spin-up and spin-down electrons are separated for the parallel configuration of the ferromagnetic strips, while they are not separated for the case of antiparallel configuration. This means that giant magnetoresistance can be produced at particular energies by altering the configurations of the ferromagnetic strips, and the device can be designed as a spin filter.

关键词: graphene nanoribbon, giant magnetoresistance, conductance, current-voltage characteristic

Abstract: We study spin transport in a zigzag graphene nanoribbon sample with two ferromagnetic strips deposited on the two sides of the ribbon. A tight-binding Hamiltonian was adopted to describe the sample connected to two one-dimensional leads. Our theoretical study shows that the resonance peaks of conductance for the spin-up and spin-down electrons are separated for the parallel configuration of the ferromagnetic strips, while they are not separated for the case of antiparallel configuration. This means that giant magnetoresistance can be produced at particular energies by altering the configurations of the ferromagnetic strips, and the device can be designed as a spin filter.

Key words: graphene nanoribbon, giant magnetoresistance, conductance, current-voltage characteristic

中图分类号:  (Electronic transport in nanoscale materials and structures)

  • 73.63.-b
72.80.Vp (Electronic transport in graphene) 85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)