Title: Large spin signal and spin rectification in folded-bilayer graphene Show Chinese title

Title: 大自旋信号和折叠双层石墨烯中的自旋整流

Abstract: Graphene is an exceptional platform for spin-based non-volatile memory, logic, and neuromorphic computing by combining long-distance spin transport with electrical tunability at room temperature. However, advancing beyond passive spin channels requires devices capable of generating large spin signals with efficient rectification capabilities, which are essential for active spintronic components. Here, we demonstrate a folded-bilayer graphene spin-valve device with giant non-local spin signals in the several mV range with pronounced spin-rectification effects. The efficient spin injection creates a giant spin accumulation of 20 meV, and generates a spin-diode effect with an asymmetry of over an order of magnitude between forward and reverse bias conditions. This spin-diode effect arises from the nonlinear coupling between large spin accumulation and the applied electric field. These large spin signals, together with the spin-diode effect, are achieved with folded-bilayer graphene, offering a promising platform for developing active ultrathin two-dimensional spintronic devices. Show Chinese abstract

Abstract: 石墨烯是一种出色的基于自旋的非易失性存储、逻辑和类脑计算平台，它结合了室温下的长距离自旋输运和电调控特性。 然而，要超越被动自旋通道，需要能够产生大自旋信号并具有高效整流能力的器件，这对于主动自旋电子器件至关重要。 在此，我们展示了一种折叠双层石墨烯自旋阀器件，在几毫伏范围内表现出巨大的非本地自旋信号，并具有显著的自旋整流效应。 高效的自旋注入产生了20毫电子伏的巨量自旋积累，并在正向和反向偏置条件下产生了超过一个数量级不对称性的自旋二极管效应。 这种自旋二极管效应源于大的自旋积累与施加电场之间的非线性耦合。 这些大的自旋信号以及自旋二极管效应通过折叠双层石墨烯实现，为开发主动超薄二维自旋电子器件提供了有前景的平台。