Challenges of measuring spin Seebeck noise
Challenges of measuring spin Seebeck noise
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测量旋转塞贝克噪声的挑战
DOI：
10.1103/physrevb.109.104429
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发表时间：
2024
影响因子：
3.7
通讯作者：
Natelson, Douglas
中科院分区：
文献类型：
--
作者：
Luo, Renjie;Zhao, Xuanhan;Legvold, Tanner J.;Chen, Liyang;Liu, Changjiang;Hong, Deshun;Bhattacharya, Anand;Natelson, Douglas
正如被驱动导体中的电子散粒噪声是由电荷的粒度和电荷载流子到达时间的统计变化引起的一样，由于离散激发携带的角动量，人们预测了磁振子电流中的基本噪声。逆自旋霍尔效应作为一种将自旋电流转换为电荷电流的换能机制，提出了这种磁振子散粒噪声实验研究的前景。自旋塞贝克效应的测量已经证明了热驱动的磁振子电流的电检测，并已被建议作为一种途径来访问自旋电流波动。我们使用由钇铁石榴石和钆镓石榴石制成的自旋塞贝克结构，展示了此类噪声测量中固有的技术挑战。虽然有一个小的增加，在低温下与添加磁场的反自旋霍尔检测器的电压噪声，依赖于磁场方向意味着这不是由于磁振子散粒噪声。我们描述了理论预测的预期大小的磁振子散粒噪声，突出存在的歧义。此外，我们表明，磁振子散粒噪声检测通过标准的逆自旋霍尔方法可能是不可能的，由于几何因素。未来的尝试来衡量磁振子散粒噪声的影响进行了讨论。
Just as electronic shot noise in driven conductors results from the granularity of charge and the statistical variation in the arrival times of charge carriers, there are predictions for fundamental noise in magnon currents due to angular momentum being carried by discrete excitations. The inverse spin Hall effect as a transduction mechanism to convert spin current into charge current raises the prospect of experimental investigations of such magnon shot noise. Spin Seebeck effect measurements have demonstrated the electrical detection of thermally driven magnon currents and have been suggested as an avenue for accessing spin current fluctuations. Using spin Seebeck structures made from yttrium iron garnet on gadolinium gallium garnet, we demonstrate the technical challenges inherent in such noise measurements. While there is a small increase in voltage noise in the inverse spin Hall detector at low temperatures associated with adding a magnetic field, the dependence on field orientation implies that this is not due to magnon shot noise. We describe theoretical predictions for the expected magnitude of magnon shot noise, highlighting ambiguities that exist. Further, we show that magnon shot noise detection through the standard inverse spin Hall approach is likely impossible due to geometric factors. Implications for future attempts to measure magnon shot noise are discussed.
影响因子：
64.8
作者：
Panpan Zhou;Liyang Chen;Yue Liu;I. Sochnikov;A. Bollinger;Myung‐Geun Han;Yimei Zhu;Xi He;I. Božović;D. Natelson
通讯作者：
Panpan Zhou;Liyang Chen;Yue Liu;I. Sochnikov;A. Bollinger;Myung‐Geun Han;Yimei Zhu;Xi He;I. Božović;D. Natelson
低温下 Pt 和 W 薄膜中的能斯特·埃廷斯豪森效应
影响因子：
4
作者：
Luo, Renjie;Legvold, Tanner J.;Chen, Liyang;Natelson, Douglas
通讯作者：
Natelson, Douglas