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Spin transport in ferromagneticormal-metal tunnel junction arrays

机译:铁磁/正态金属隧道结阵列中的自旋输运

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摘要

An array of alternating ferromagnetic and normal-metal islands separated by small tunnel junctions is theoretically investigated in the sequential tunneling regime. A numerical Monte Carlo method is used to calculate the transport properties. The spin-dependent tunneling currents give rise to nonequilibrium spin accumulation on the normal island. The tunneling magneto resistance (TMR) is calculated for a large range of array parameters. The TMR oscillates with bias voltage and can become negative for certain array parameters. We show that the long-range electrostatic interaction in the arrays can significantly increase the TMR; for experimentally accessible parameters the magnitude of the TMR can be as large as 100%.
机译:理论上在顺序隧穿机制中研究了由小隧道结隔开的一系列交替的铁磁岛和正常金属岛。数值蒙特卡罗方法用于计算传输特性。自旋相关的隧穿电流在正常岛上引起非平衡自旋累积。对于大范围的阵列参数,计算出隧道磁阻(TMR)。 TMR在偏置电压下振荡,对于某些阵列参数可能会变为负值。我们表明,阵列中的远距离静电相互作用可以显着增加TMR。对于实验可访问的参数,TMR的大小可以高达100%。

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