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.
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.
作者
赵华
张小伟
蔡托
桑田
刘晓春
刘芳
Zhao Hua;Zhang Xiao-Wei;Cai Tuo;Sang Tian;Liu Xiao-Chun;Liu Fang(Department of Physics and Electronics,Qiannan Normal College for Nationalities,Duyun 558000,China)
基金
Project supported by the National Natural Science Foundation of China(Grant No.11064010)
the Project of Qiannan Normal College for Nationalities,China(Grant No.QNSY201012)
