Junction resistance, tunnel magnetoresistance ratio, and spin-transfer torque in Zn-doped magnetic tunnel junctions

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	Junction resistance, tunnel magnetoresistance ratio, and spin-transfer torque in Zn-doped magnetic tunnel junctions
	Liu, DP ; Han, XF ; Guo, H
刊名	PHYSICAL REVIEW B
	2012
卷号	85 期号:24
关键词	ROOM-TEMPERATURE MGO EMISSION BARRIERS LAYERS WAVES
ISSN号	1098-0121
通讯作者	Liu, DP: McGill Univ, Ctr Phys Mat, Montreal, PQ H3A 2T8, Canada.
中文摘要	We report an extensive theoretical investigation of impurity doping and alloying effects to spin-polarized quantum tunneling in Fe/MgO/Fe magnetic tunneling junctions. We find that with proper impurity atoms, an optimal device characteristic regime can be established where the junction resistance R-J is nonlinearly quenched while the tunnel magnetoresistance ratio (TMR) is only linearly reduced. As a consequence, the spin transfer torque is significantly increased by a factor similar to the R-J reduction. We search for this optimal device regime using first-principles calculations by doping MgO with different impurity atoms. We predict that Zn has the desired property due to a well-balanced effect of producing gap states that mediate charge transport, thus quenching R-J, and producing relatively weak interchannel coupling to alleviate the detrimental diffusive scattering effect on the TMR.
收录类别	SCI
资助信息	Natural Sciences and Engineering Research Council of Canada; National Natural Science Foundation [11104338, 51021061]; Ministry of Science and Technology of China [2010CB934400, 2011YQ120053]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/40436]
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	Liu, DP,Han, XF,Guo, H. Junction resistance, tunnel magnetoresistance ratio, and spin-transfer torque in Zn-doped magnetic tunnel junctions[J]. PHYSICAL REVIEW B,2012,85(24).
APA	Liu, DP,Han, XF,&Guo, H.(2012).Junction resistance, tunnel magnetoresistance ratio, and spin-transfer torque in Zn-doped magnetic tunnel junctions.PHYSICAL REVIEW B,85(24).
MLA	Liu, DP,et al."Junction resistance, tunnel magnetoresistance ratio, and spin-transfer torque in Zn-doped magnetic tunnel junctions".PHYSICAL REVIEW B 85.24(2012).