This work tackles the long-standing issue on a quantitative disentanglement of spin orbit torques (SOTs) in platinum/cobalt (Pt/Co) bilayers where both spin Hall effect (SHE) and Rashba-Edelstein effect (REE) are present. The SOTs originated from the SHE in bulk Pt and from the REE at substrate (sub.)/Pt and Pt/Co interfaces are successfully disentangled and quantified utilizing the harmonic Hall measurements, by taking advantage of the different characteristic lengths between the two effects during spin current transport. The field-like SOT (FL-SOT) in our samples is originated from the REE, while both SHE and REE contribute to the damping-like SOT (DL-SOT). The extracted REE-induced FL-SOT (and also DL-SOT) efficiencies at sub./Pt and Pt/Co interfaces are in the same order of magnitude, but of opposite signs, consistent with the REE scenario. The origin of the observed temperature dependent SOT sign reversal is clarified with our disentanglement analysis, demonstrating the significant role of REE at both sub./Pt and Pt/Co interfaces, in contributing to the overall SOTs, as the thickness of SO material shrinks down to the thin limit.

中文翻译：

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具有自旋霍尔效应和Rashba-Edelstein效应的Pt / Co双层自旋轨道扭矩解缠

这项工作解决了长期存在的问题，即铂/钴（Pt / Co）双层中存在自旋霍尔效应（SHE）和Rashba-Edelstein效应（REE）的自旋轨道扭矩（SOT）的定量解缠。通过利用谐波霍尔测量，利用两个效应之间的不同特征长度，成功地解散和量化了源自散装Pt的SHE以及来自底物（sub。）/ Pt和Pt / Co界面的REE的SOT，并对其进行了量化自旋电流传输。我们样本中的类似场的SOT（FL-SOT）源自REE，而SHE和REE都对类似阻尼的SOT（DL-SOT）有所贡献。在sub./Pt和Pt / Co界面处提取的REE引起的FL-SOT（以及DL-SOT）效率与REE场景具有相同的数量级，但符号相反。