Organic magnetic tunnel junctions: The role of metal-molecule interface

CORC > 物理研究所 > 物理所公开发表论文 > 期刊论文

	Organic magnetic tunnel junctions: The role of metal-molecule interface
	Liang, SH ; Liu, DP ; Tao, LL ; Han, XF ; Guo, H
刊名	PHYSICAL REVIEW B
	2012
卷号	86 期号:22
关键词	SPIN INJECTION SPINTRONICS
ISSN号	1098-0121
通讯作者	Liang, SH (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, State Key Lab Magnetism, Beijing 100190, Peoples R China.
中文摘要	We report a first-principles theoretical investigation of spin-polarized quantum transport in organic magnetic tunnel junctions (OMTJs) to provide a microscopic understanding on the sign of the tunnel magnetoresistance ratio (TMR). We consider two different OMTJs, formed by sandwiching 1-stearic acid radicals (1-SAR) or 1,18-stearic diacid radicals (1,18-SDR) between two Ni electrodes. Even though the main difference between them is only on one of the Ni/molecule contacts, such a structure difference is found to induce a significant sign change of the TMR. The TMR is negative for 1-SAR at -19.6%, but is positive for 1,18-SDR at 13.7%. By investigating the concept of scattering density of states (SDOS), we found that scattering processes of p electrons at the Ni/molecule interface determines the sign of TMR. Based on spin polarization of the SDOS, we extend the Julliere model to explain both the sign and the value of the TMR qualitatively and semiquantitatively. It is concluded that understanding spin-polarized quantum transport in organic magnetic tunnel junction requires a comprehensive knowledge of the electronic structures of the molecule, the metal electrode, and the metal-molecule contacts. DOI: 10.1103/PhysRevB.86.224419
收录类别	SCI
资助信息	Ministry of Science and Technology (MOST) [2010CB934400]; National Natural Science Foundation of China (NSFC) [10934099, 51021061]; NSFC [10911130234, F040803]; EPSRC of United Kingdom [10911130234]; ANR of France [F040803]; NSERC of Canada
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/50448]
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	Liang, SH,Liu, DP,Tao, LL,et al. Organic magnetic tunnel junctions: The role of metal-molecule interface[J]. PHYSICAL REVIEW B,2012,86(22).
APA	Liang, SH,Liu, DP,Tao, LL,Han, XF,&Guo, H.(2012).Organic magnetic tunnel junctions: The role of metal-molecule interface.PHYSICAL REVIEW B,86(22).
MLA	Liang, SH,et al."Organic magnetic tunnel junctions: The role of metal-molecule interface".PHYSICAL REVIEW B 86.22(2012).