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
刊名	Journal of Physics-Condensed Matter
	2010
卷号	22 期号:44
关键词	magnetic multilayers room-temperature magnetoresistance junctions
ISSN号	0953-8984
中文摘要	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.
原文出处	://WOS:000283347400003
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/31772]
专题	金属研究所_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).