NiO在Y-PDMATHAAB-Fe-PDMATHAAC-O-$_{12}$-NiO薄膜非局域自旋输运中的作用
Role of NiO in the nonlocal spin transport through thin NiO films on Y$_3$Fe$_5$O$_{12}$
摘要：
在自旋输运实验中，自旋电流通过反铁磁（AFM）材料传播，反铁磁被视为一个主要的被动自旋导体不产生或增加任何自旋电流的系统。AFM NiO的自旋电流transmittance受磁场涨落的影响，在Néel温度处达到峰值，并通过降低温度而降低。为了研究原子力显微镜在局域和非局域自旋输运实验中的作用，我们发送自旋电流通过NiO的不同厚度放置在Y $_3$ Fe $_5$ O $_{12}$。自旋电流通过电或热梯度注入，并在很宽的温度和磁场强度范围内进行测量。透射作用反映在局部电注入信号的符号变化和通过降低温度而降低的所有其它信号的信号强度中。然而，热产生的信号显示出低于100 $\,$ K的额外的上升，其不受NiO厚度增加的影响。热导率的变化可能会影响这些信号。的温度和磁场的依赖性是类似的散装NiO，表明NiO本身有助于热诱导的自旋电流。
英文摘要：
In spin transport experiments with spin currents propagating through antiferromagnetic (AFM) material, the antiferromagnet is treated as a mainly passive spin conductor not generating nor adding any spin current to the system. The spin current transmissivity of the AFM NiO is affected by magnetic fluctuations, peaking at the Néel temperature and decreasing by lowering the temperature. In order to study the role of the AFM in local and nonlocal spin transport experiments, we send spin currents through NiO of various thickness placed on Y$_3$Fe$_5$O$_{12}$. The spin currents are injected either electrically or by thermal gradients and measured at a wide range of temperatures and magnetic field strengths. The transmissive role is reflected in the sign change of the local electrically injected signals and the decrease in signal strength of all other signals by lowering the temperature. The thermally generated signals, however, show an additional upturn below 100$\,$K which are unaffected by an increased NiO thickness. A change in the thermal conductivity could affect these signals. The temperature and magnetic field dependence is similar as for bulk NiO, indicating that NiO itself contributes to thermally induced spin currents.
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