Giant Coulomb blockade magnetoresistance in magnetic tunnel junctions with a granular layer

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	Giant Coulomb blockade magnetoresistance in magnetic tunnel junctions with a granular layer
	Zhang, XG ; Wen, ZC ; Wei, HX ; Han, XF
刊名	PHYSICAL REVIEW B
	2010
卷号	81 期号:15
关键词	ROOM-TEMPERATURE QUANTUM DOTS CHARGE
ISSN号	1098-0121
通讯作者	Zhang, XG: Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
中文摘要	We investigate spin-dependent electron transport through a zigzag graphene nanoribbon sample with two ferromagnetic strips deposit on two sides of the graphene ribbon. Our results show that, for the antiparallel configurations of ferromagnetic strips, the conductance exhibits zero conductance plateau when the Fermi energy locates around the Dirac point and the sample shows the properties of a semiconductor. But for the parallel configurations, the energy band spectrum is metallic and the conductance is always equal to or larger than e(2)/h. Thus the huge giant magnetoresistance effect can be achieved by altering the configurations of the ferromagnetic strips. Moreover, we study the spin-dependent conductance for the parallel configuration. It is found that the device shows half-metal behavior, in which it acts as a conductor to carriers of one spin orientation but as an insulator to those of the opposite spin orientation. So the present device can be applied as a spin filter. In addition, we study the consequence of the short-range Anderson disorder and find that the spin filtering effect and magnetoresistance effect still remain even in the strong disorder limit.
收录类别	SCI
资助信息	State Key Project of Fundamental Research of Ministry of Science and Technology (MOST) [2006CB932200, 2010CB934400]; National Natural Science Foundation (NSFC) [10874225, 50928101, 50721001]; Beijing Municipal Commission of Education; K. C. Wong Education Foundation, Hong Kong
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/38721]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhang, XG,Wen, ZC,Wei, HX,et al. Giant Coulomb blockade magnetoresistance in magnetic tunnel junctions with a granular layer[J]. PHYSICAL REVIEW B,2010,81(15).
APA	Zhang, XG,Wen, ZC,Wei, HX,&Han, XF.(2010).Giant Coulomb blockade magnetoresistance in magnetic tunnel junctions with a granular layer.PHYSICAL REVIEW B,81(15).
MLA	Zhang, XG,et al."Giant Coulomb blockade magnetoresistance in magnetic tunnel junctions with a granular layer".PHYSICAL REVIEW B 81.15(2010).