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Spin Torque in Double Planar Tunnel Junctions

机译:双平面隧道连接处的旋转扭矩

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摘要

Transport in a double planar tunnel junction with ferromagnetic electrodes is analyzed theoretically in the zero-temperature limit. The in-plane and out-of-plane components of the spin torque exerted on magnetic moment of the central layer are determined as a function of the angle θ between magnetic moments of one of the external electrodes and of the central layer. Two configurations of the magnetic moments of external electrodes are considered, i.e. parallel and antiparallel ones. It is found that both torque components depend strongly on the thickness of the central layer, especially in junctions with a relatively thin central layer, where enhancement of the torque or a change of its sign can be observed for specific layer thicknesses. In junctions with thick central layer and in the limit of small bias voltage applied to the junction, the in-plane torque is generally smaller in the parallel configuration than in the antiparallel one. The opposite relation is observed for the normal torque.
机译:理论上在零温度范围内分析了具有铁磁电极的双平面隧道结中的传输。施加在中心层的磁矩上的自旋扭矩的平面内和平面外分量根据外部电极之一和中心层的磁矩之间的角度θ确定。考虑了外部电极的磁矩的两种配置,即,平行和反平行的。已经发现,两个转矩分量都强烈地取决于中心层的厚度,特别是在与相对薄的中心层的接合处,其中对于特定的层厚度,可以观察到转矩的增强或其符号的改变。在中心层较厚的结中,并且在向结施加小的偏置电压的限制内,平行配置中的面内扭矩通常小于反平行扭矩。对于正常转矩观察到相反的关系。

著录项

  • 来源
    《Acta physica polonica A》|2008年|269-271|共3页
  • 会议地点 Poznan(PL);Poznan(PL)
  • 作者单位

    Faculty of Physics, Warsaw University of Technology Koszykowa 75, 00-662 Warsaw, Poland;

    Faculty of Physics, Warsaw University of Technology Koszykowa 75, 00-662 Warsaw, Poland;

    Department of Physics, Adam Mickiewicz University Umnltowska 85, 61-614 Poznan, Poland Institute of Molecular Physics, Polish Academy of Sciences M. Smoluchowskiego 17, 60-179 Poznan, Poland;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理学;
  • 关键词

    tunneling; spin polarized transport;

    机译:隧道自旋极化传输;

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