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Significant modulation of electrical spin accumulation by efficient thermal spin injection

机译:通过有效的热自旋注入显着调节电自旋累积

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摘要

We have investigated the dc bias current dependence of the nonlocal spin valve signal in CoFeAl/Cu lateral spin valves. The spin signal is found to increase monotonically with the bias current. Surprisingly, the modulation amplitude from - 1 mA to 1 mA exceeds 30 percent of the spin signal at low bias current. From the analysis based on the one-dimensional spin diffusion model and considering the bias-current heating effect, we find that the contribution of the thermal spin injection is much larger than the influence of the reduction of the spin diffusion length due to the Joule heating. We also show that the second harmonic lock-in signal precisely extracts the contribution of the thermal spin injection from the mixed spin signal.
机译:我们研究了CoFeAl / Cu侧向自旋阀中非局部自旋阀信号的直流偏置电流依赖性。发现自旋信号随偏置电流单调增加。令人惊讶的是,在低偏置电流下,从-1 mA到1 mA的调制幅度超过了自旋信号的30%。通过基于一维自旋扩散模型的分析并考虑偏流加热效应,我们发现热自旋注入的贡献远大于因焦耳热而导致的自旋扩散长度减小的影响。我们还表明,二次谐波锁定信号可以精确地从混合自旋信号中提取热自旋注入的贡献。

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  • 来源
    《Physical review》 |2014年第13期|134412.1-134412.4|共4页
  • 作者

    Shaojie Hu; Takashi Kimura;

  • 作者单位

    Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan;

    Department of Physics, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581, Japan,Research Center for Quantum Nano-Spin Sciences, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581, Japan,CREST, Japan Science and Technology Agency, Sanbancho, Tokyo 102-0075, Japan;

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