Nonuniversal shot noise in quasiequilibrium spin valves

T. T. Heikkilae; K. E. Nagaev

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Nonuniversal shot noise in quasiequilibrium spin valves

机译：准平衡自旋阀的非普遍散粒噪声

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摘要

We show that the breakdown of the Wiedemann-Franz law due to electron-electron scattering in diffusive spin valves may result in a strong suppression of the Fano factor that describes the ratio between shot noise and average current. In the parallel configuration of magnetizations, we find the universal value 3~(1/2)/4 in the absence of a normal-metal spacer layer, but including the spacer leads to a nonmonotonous suppression of this value before reaching back to the universal value for large spacer lengths. On the other hand, in the case of an antiparallel configuration with a negligibly small spacer, the Fano factor is (3(1 — P~2))~(1/2)/4, where P denotes the polarization of the conductivities. For P →±1, the current through the system is almost noiseless.

机译：我们表明，由于扩散自旋阀中的电子-电子散射，Wiedemann-Franz定律的破坏可能导致对描述散粒噪声与平均电流之比的Fano因子的强烈抑制。在平行磁化的配置中，我们发现在没有普通金属间隔层的情况下，通用值为3〜（1/2）/ 4，但是在返回到通用范围之前，包含间隔会导致该值的非单调抑制较大的垫片长度时的数值。另一方面，在间隔物很小的反平行结构的情况下，法诺因子为（3（1_P〜2））〜（1/2）/ 4，其中P表示电导率的极化。对于P→±1，流经系统的电流几乎无噪声。

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来源
《Physical review》 |2013年第23期|235411.1-235411.5|共5页
作者
T. T. Heikkilae; K. E. Nagaev;
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作者单位

Low Temperature Laboratory, Aalto University, P. O. Box 15100, FI-00076 AALTO, Finland;

Kotelnikov Institute of Radioengineering and Electronics, Mokhovaya 11-7, Moscow 125009, Russia,Moscow Institute of Physics and Technology, Institutsky per. 9, Dolgoprudny 141700, Russia;

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正文语种 eng
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magnetotransport phenomena; materials for magnetotransport; spin polarized transport in metals; noise processes and phenomena;

机译：磁传输现象;磁运输材料;在金属中旋转极化传输;噪声过程和现象;

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机译：准平衡自旋阀中的非通用散粒噪声

Nonuniversal shot noise in quasiequilibrium spin valves

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