Spin-polarized transport in graphene nanoribbon superlattices

doi:10.1088/1674-1056/21/10/107202

Abstract By the Green's function method, we investigate spin transport properties of a zigzag graphene nanoribbon superlattice (ZGNS) under a ferromagnetic insulator and edge effect. The exchange splitting induced by the ferromagnetic insulator eliminates the spin degeneracy, which leads to spin-polarized transport in structure. Spin-dependent minibands and minigaps are exhibited in the conductance profile near the Fermi energy. The location and width of the miniband are associated with the geometry of the ZGNS. In the optimal structure, the spin-up and spin-down minibands can be separated completely near the Fermi energy. Therefore, a wide, perfect spin polarization with clear stepwise pattern is observed, i.e., the perfect spin-polarized transport can be tuned from spin up to spin down by varying the electron energy.

Keywords: spintronics superlattices zigzag graphene nanoribbons

Received: 08 March 2012
Revised: 04 May 2012
Accepted manuscript online:

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

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51006086, 11074213, and 51176161), the Open Fund Based on Innovation Platform of Hunan Colleges and Universities, China (Grant No. 09K034), and the Joint Funds of Hunan Provincial Natural Science Foundation, China (Grant No. 10JJ9001).

Corresponding Authors: Chen Yuan-Ping
E-mail: chenyp@xtu.edu.cn

Cite this article:

Yu Xin-Xin (余欣欣), Xie Yue-E (谢月娥), Yang Tao (欧阳滔), Chen Yuan-Ping (陈元平) Spin-polarized transport in graphene nanoribbon superlattices 2012 Chin. Phys. B 21 107202

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