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Dynamical spin accumulation in large-spin magnetic molecules

机译:大自旋磁性分子中的动态自旋积累

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摘要

The frequency-dependent transport through a nanodevice containing a large-spin magnetic molecule is studied theoretically in the Kondo regime. Specifically, the effect of magnetic anisotropy on dynamical spin accumulation is of primary interest. Such accumulation arises due to finite components of frequency-dependent conductance that are off diagonal in spin. Here, employing the Kubo formalism and the numerical renormalization group method, we demonstrate that the dynamical transport properties strongly depend on the relative orientation of spin moments in electrodes of the device, as well as on intrinsic parameters of the molecule. In particular, the effect of dynamical spin accumulation is found to be greatly affected by the type of magnetic anisotropy exhibited by the molecule, and it develops for frequencies corresponding to the Kondo temperature. For the parallel magnetic configuration of the device, the presence of dynamical spin accumulation is conditioned by the interplay of ferromagnetic-lead-induced exchange field and the Kondo correlations.
机译:在近藤研究中理论上研究了通过包含大旋转磁性分子的纳米器件的频率依赖性传输。特别地,磁各向异性对动态自旋积累的影响是主要关注的问题。由于频率相关电导的有限分量在自旋中不成对角线,因此会产生这种累积。在这里,我们使用Kubo形式主义和数值归一化群方法,证明了动态传输特性强烈取决于器件电极中自旋矩的相对方向以及分子的固有参数。特别地,发现动态自旋累积的影响受分子表现出的磁各向异性的类型极大地影响,并且其发展为对应于近藤温度的频率。对于设备的平行磁配置,动态自旋累积的存在是受铁磁铅诱导的交换场和Kondo相关性相互作用的制约。

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  • 来源
    《Physical review》 |2018年第3期|035415.1-035415.18|共18页
  • 作者单位

    Faculty of Physics, Adam Mickiewicz University, 61-614 Poznari, Poland;

    Faculty of Physics, Adam Mickiewicz University, 61-614 Poznari, Poland;

    Faculty of Physics, Adam Mickiewicz University, 61-614 Poznari, Poland,Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-412 96 Goteborg, Sweden;

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