论文标题
设计四端自旋阀的路线图和旋转扩散长度的提取
A roadmap for the design of four-terminal spin valves and the extraction of spin diffusion length
论文作者
论文摘要
石墨烯是由于其出色的电子迁移率和低自旋轨道耦合而成为未来旋转型设备的有前途的底物。自旋阀装置中的Hanle进动通常用于评估自旋扩散和自旋寿命特性。在这项工作中，我们证明当内部电极和外部电极之间的距离小于旋转扩散长度的六倍时，该方法不再准确，导致误差高达50％，以计算石墨烯优异的旋转图。我们建议通过解决Hanle Fit功能的修订版，提出简单但有效的方法来规避此限制。补充，我们为设计四端自旋阀的设计提供了明确的指南，以产生自旋寿命和自旋扩散系数的完美估计。
Graphene is a promising substrate for future spintronics devices owing to its remarkable electronic mobility and low spin-orbit coupling. Hanle precession in spin valve devices is commonly used to evaluate the spin diffusion and spin lifetime properties. In this work, we demonstrate that this method is no longer accurate when the distance between inner and outer electrodes is smaller than six times the spin diffusion length, leading to errors as large as 50% for the calculations of the spin figures of merit of graphene. We suggest simple but efficient approaches to circumvent this limitation by addressing a revised version of the Hanle fit function. Complementarily, we provide clear guidelines for the design of four-terminal spin valves able to yield flawless estimations of the spin lifetime and the spin diffusion coefficient.
