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arXiv 0811.0204cond-mat.mes-hall
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电子输运驱动的自旋动力学

Electronic transport driven spin-dynamics

L. Siddiqui, D. Saha, S. Datta, P. Bhattacharya

摘要:

我们提出了一个模型来探索通过交换相互作用与半导体材料的导带电子耦合的自旋系统的动力学,该半导体材料形成铁磁/半导体/铁磁自旋阀结构中的沟道。我们表明,最近在MnAs/GaAs/MnAs自旋阀结构中观察到的新的瞬态输运特征与顺磁性Mn杂质[D. Saha等人,物理学评论快报,100,196603(2008)]可以根据Mn自旋的电流驱动的动态极化来定量地理解。使用我们的模型自旋极化运输通过肖特基势垒在两个铁磁/半导体结中的自旋阀结构和动力学方程描述的顺磁性杂质耦合到导带电子,我们解释了所观察到的瞬态特性,如幅度和时间尺度与温度的标度行为。

英文摘要:

We propose a model to explore the dynamics of spin-systems coupled by exchange interaction to the conduction band electrons of a semiconductor material that forms the channel in a ferromagnet/semiconductor/ferromagnet spin-valve structure. We show that recent observation of the novel transient transport signature in a MnAs/GaAs/MnAs spin-valve structure with paramagnetic Mn impurities [D. Saha et al., Phys. Rev. Lett., 100, 196603 (2008)] can be quantitatively understood in terms of current driven dynamical polarization of Mn spins. Using our model of spin polarized transport through Schottky barriers at the two ferromagnet/semiconductor junctions in a spin-valve structure and a dynamical equation describing the paramagnetic impurities coupled to conduction band electrons we explain the scaling behaviour of observed transient features such as the magnitude and time-scale with temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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