Spin currents and magnetoresistance of graphene-based magnetic junctions

被引:0
作者
A. Saffarzadeh
M. Ghorbani Asl
机构
[1] Payame Noor University,Department of Physics
[2] Computational Physical Sciences Laboratory,Department of Nano
[3] Islamic Azad University,Science, Institute for Research in Fundamental Sciences (IPM)
来源
The European Physical Journal B | 2009年 / 67卷
关键词
72.25.Mk Spin transport through interfaces; 73.23.Ad Ballistic transport;
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学科分类号
摘要
Using the tight-binding approximation and the nonequilibrium Green’s function approach, we investigate the coherent spin-dependent transport in planar magnetic junctions consisting of two ferromagnetic (FM) electrodes separated by a graphene flake (GF) with zigzag or armchair interfaces. It is found that the electron conduction strongly depends on the geometry of contact between the GF and the FM electrodes. In the case of zigzag interfaces, the junction demonstrates a spin-valve effect with high magnetoresistance (MR) ratios and shows negative differential resistance features for a single spin channel at positive gate voltage. In the case of armchair interfaces, the current-voltage characteristics behave linearly at low bias voltages and hence, both spin channels are in on state with low MR ratios.
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页码:239 / 244
页数:5
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