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arXiv 0704.3949cond-mat.mtrl-scicond-mat.other
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35%磁流,自旋输运通过Si

35% magnetocurrent with spin transport through Si

Biqin Huang, Lai Zhao, Douwe J. Monsma, Ian Appelbaum

摘要:

自旋极化电子有效注入硅的导带受到铁磁金属(FM)/硅界面处硅化物形成的限制。在目前的工作中,这种“磁死”硅化物(强自旋散射显着降低注入自旋极化)被消除移动的FM在自旋注入器从隧道结基极阳极的发射极阴极和远离硅表面。这导致自旋注入效率增加了一个数量级,从先前报道的~2%到~35%的磁流比,以及Si中估计的自旋极化从~1%到至少~ 15%。还测量了这种自旋输运信号的注入器隧道结偏置依赖性,证明了低偏置电压对保持高注入自旋极化的重要性。

英文摘要:

Efficient injection of spin-polarized electrons into the conduction band of silicon is limited by the formation of a silicide at the ferromagnetic metal (FM)/silicon interface. In the present work, this "magnetically-dead" silicide (where strong spin-scattering significantly reduces injected spin polarization) is eliminated by moving the FM in the spin injector from the tunnel junction base anode to the emitter cathode and away from the silicon surface. This results in over an order-of-magnitude increase in spin injection efficiency, from a previously-reported magnetocurrent ratio of ~2% to ~35% and an estimated spin polarization in Si from ~1% to at least ~15%. The injector tunnel-junction bias dependence of this spin transport signal is also measured, demonstrating the importance of low bias voltage to preserve high injected spin polarization.

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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