磁绝缘体中自旋-轨道矩探测外延Pt的电荷-自旋相互转换
Charge-Spin Interconversion in Epitaxial Pt Probed by Spin-Orbit Torques in a Magnetic Insulator
摘要：
我们测量自旋轨道扭矩（SOTs）在一个独特的模型系统的所有外延铁氧体/Pt双层，以深入了解在Pt的电荷-自旋相互转换。由于绝缘铁氧体中的电子传导可以忽略不计，结晶Pt膜充当电荷到自旋转换的唯一来源。独立于Pt厚度的小场SOT表明铁氧体/Pt界面处的弱Rashba-Edelstein效应。相比之下，我们观察到一个相当大的阻尼样的SOT，取决于Pt的厚度，从中我们推导出一个外来的自旋霍尔效应（斜散射）和Dyakonov-Perel自旋弛豫的结晶Pt膜的主导地位。此外，我们的研究结果指出，一个大的内部自旋霍尔比$\approx$ 0.8的外延Pt。我们的实验工作朝着理解Pt基异质结构中的电荷-自旋相互转换和SOT的机制迈出了重要的一步，这对于高效自旋电子器件至关重要。
英文摘要：
We measure spin-orbit torques (SOTs) in a unique model system of all-epitaxial ferrite/Pt bilayers to gain insights into charge-spin interconversion in Pt. With negligible electronic conduction in the insulating ferrite, the crystalline Pt film acts as the sole source of charge-to-spin conversion. A small field-like SOT independent of Pt thickness suggests a weak Rashba-Edelstein effect at the ferrite/Pt interface. By contrast, we observe a sizable damping-like SOT that depends on the Pt thickness, from which we deduce the dominance of an extrinsic spin-Hall effect (skew scattering) and Dyakonov-Perel spin relaxation in the crystalline Pt film. Furthermore, our results point to a large internal spin-Hall ratio of $\approx$0.8 in epitaxial Pt. Our experimental work takes an essential step towards understanding the mechanisms of charge-spin interconversion and SOTs in Pt-based heterostructures, which are crucial for power-efficient spintronic devices.
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