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

作　　者：Tian Hong-Yu Wang Jun 田宏玉;汪军(Department of Physics,Southeast University,Nanjing 210096,China)

机构地区：[1]Department of Physics,Southeast University,Nanjing 210096,China

出　　处：《Chinese Physics B》2012年第1期433-437,共5页中国物理B（英文版）

基　　金：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);the National Basic Research Program of China(Grant No.2009CB945504)

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.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 quantumswitching effect 

分 类 号：TB383.1[一般工业技术—材料科学与工程]