Effect of spin-flip scattering on electrical transport in magnetic tunnel junctions

被引：26
作者：
Zhu, ZG [1 ]
Su, G [1 ]
Zheng, QR [1 ]
Jin, B [1 ]
机构：
[1] Chinese Acad Sci, Grad Sch, Dept Phys, Beijing 100039, Peoples R China
来源：
PHYSICS LETTERS A | 2002年 / 300卷 / 06期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1016/S0375-9601(02)00894-0
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
By means of the nonequilibrium Green function technique, the effect of spin-flip scatterings on the spin-dependent electrical transport in ferromagnet-insulator-ferromagnet (FM-I-FM) tunnel junctions is investigated. It is shown that Julliere's formula for the tunnel conductance must be modified when including the contribution from the spin-flip scatterings. It is found that the spin-flip scatterings could lead to an angular shift of the tunnel conductance, giving rise to the junction resistance not being the largest when the orientations of magnetizations in the two FM electrodes are antiparallel, which may offer an alternative explanation for such a phenomenon observed previously in experiments in some FM-I-FM junctions. The spin-flip assisted tunneling is also observed. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：658 / 665
页数：8
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