Magnetotransport and current-induced spin transfer torque in a ferromagnetically contacted graphene

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	Magnetotransport and current-induced spin transfer torque in a ferromagnetically contacted graphene
	B. H. Zhou; X. W. Chen; H. Y. Wang; K. H. Ding; G. H. Zhou
	2010
发表期刊	Journal of Physics-Condensed Matter
ISSN	0953-8984
卷号	22 期号:44
摘要	We theoretically investigate the spin-dependent transport through a graphene sheet between two ferromagnetic (FM) leads with arbitrary polarization directions at low temperatures, where a magnetic insulator is deposited on the graphene to induce an exchange splitting between spin-up and spin-down carriers. By using standard nonequilibrium Green's function (NGF) techniques, it is demonstrated that the density of states (DOS) decreases for spin-up and increases for spin-down when the polarization strength of the two leads in parallel alignment increases. For the electron energy around the exchange splitting, the DOS for both spin-up and spin-down channels is independent of the polarization. In contrast, the conductance increases for spin-up but decreases for spin-down with an increase of the polarization. Interestingly, the magnitude of tunneling magnetoresistance (TMR) can be dramatically suppressed with the increase of the exchange splitting in graphene. Furthermore, the current-induced spin transfer torque (STT) dependence on the relative angle. between the magnetic moments of the two leads shows a sine-like behavior and is enhanced with an increase of the polarization and/or the bias voltage. We attribute these spin-resolved effects to the breaking of the insulator-type properties of graphene with an exchange splitting between spin-up and spin-down carriers.
部门归属	[zhou, benhu; chen, xiongwen; wang, haiyan; zhou, guanghui] hunan normal univ, dept phys, minist educ, changsha 410081, peoples r china. [zhou, benhu; chen, xiongwen; wang, haiyan; zhou, guanghui] hunan normal univ, key lab low dimens quantum struct & manipulat, minist educ, changsha 410081, peoples r china. [ding, kai-he] changsha univ sci & technol, dept phys & elect sci, changsha 410076, peoples r china. [zhou, guanghui] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china.;zhou, gh (reprint author), hunan normal univ, dept phys, minist educ, changsha 410081, peoples r china;ghzhou@hunnu.edu.cn
关键词	Magnetic Multilayers Room-temperature Magnetoresistance Junctions
URL	查看原文
WOS记录号	WOS:000283347400003
引用统计	被引频次：34[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31772
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	B. H. Zhou,X. W. Chen,H. Y. Wang,et al. Magnetotransport and current-induced spin transfer torque in a ferromagnetically contacted graphene[J]. Journal of Physics-Condensed Matter,2010,22(44).
APA	B. H. Zhou,X. W. Chen,H. Y. Wang,K. H. Ding,&G. H. Zhou.(2010).Magnetotransport and current-induced spin transfer torque in a ferromagnetically contacted graphene.Journal of Physics-Condensed Matter,22(44).
MLA	B. H. Zhou,et al."Magnetotransport and current-induced spin transfer torque in a ferromagnetically contacted graphene".Journal of Physics-Condensed Matter 22.44(2010).