论文标题
通过磁绝缘体中的自旋轨道探测的外延PT中的电荷旋转互连
Charge-Spin Interconversion in Epitaxial Pt Probed by Spin-Orbit Torques in a Magnetic Insulator
论文作者
论文摘要
我们在全外超铁氧体/PT双层的独特模型系统中测量自旋轨道扭矩（SOT），以洞悉PT中的电荷旋转互连。在绝缘铁氧体中可忽略不计的电子传导，晶体PT膜起到了唯一的电荷到旋转转换的来源。与PT厚度无关的小场状SOT表明，铁氧体/PT界面处的Rashba-Edelstein效应弱。相比之下，我们观察到一个相当大的阻尼状SOT，该SOT取决于PT厚度，从中我们推断出外在的自旋式霍尔效应（偏斜散射）和Dyakonov-perel Spin在结晶PT膜中的主导地位。此外，我们的结果指出，外延PT的较大内置旋转比率约为$ \ $ 0.8。我们的实验工作朝着理解基于PT的异质结构中电荷旋转互连和SOT的机制迈出了重要的一步，这对于效力有效的Spintronic设备至关重要。
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.
