Picosecond superconductivity-driven spin-torques

与传统的半导体逻辑相比，超导逻辑在计算能力和能耗方面都有显着改进的希望，这是因为在传输位时没有欧姆损耗。然而，这些优点中的大多数由于缺乏可以耦合到超导逻辑的合适的低温存储器而被否定。超导自旋电子学的目标是通过集成磁性和超导元件来开发超导存储器。最近的发现显示了超导性和磁性合作的新途径，使基于自旋，电荷和超导相位相干性之间相互作用的新器件概念成为可能。这包括超低能量磁读出在超导等效的巨磁阻阀的演示。PICaSSO的愿景是通过利用两种不同的效应：超导体诱导的磁各向异性和超导诱导的自旋积累，通过直接源自超导相关的扭矩实现磁体的皮秒开关。为了实现这一愿景，PICaSSO采用了时间分辨的方法，将拍摄不同混合磁超导结构中自旋和超导性之间的相互作用，其时间分辨率与它们的基本相互作用时间相当。这将使耦合磁体和超导体在尽可能快的时间尺度，并将允许在s波超导体的瞬态三重态相关的第一次研究。在PICaSSO进行的研究将为超快超导自旋电子学奠定基础，并为超导存储器和逻辑器件的全面集成铺平道路。

Superconducting logic holds the promise of significant improvement compared to traditional semiconductor logic, both in terms of computational power and energy consumption, due to the lack of ohmic losses when transferring bits. However, most of these advantages are negated by the lack of a suitable cryogenic memory that can be coupled to the superconducting logic. The ambition of superconducting spintronics is to develop a superconducting memory by integrating magnetic and superconducting elements. Recent discoveries have shown new routes for superconductivity and magnetism to co-operate, enabling new device concepts based on the interplay between spin, charge and superconducting phase coherence. This includes the demonstration of ultra-low energy magnetic read-out in the superconducting equivalent of a giant-magneto-resistance valve. The vision of PICaSSO is to achieve the picosecond switching of a magnet via torques directly originating in the superconducting correlation by exploiting two different effects: superconductor-induced magnetic anisotropy and supercurrent-induced spin accumulation. To realise this vision PICaSSO adopts time-resolved methods that will photograph the interplay between spins and superconductivity in different hybrid magnetic-superconducting structures with a time resolution comparable with their fundamental interaction time. This will enable coupling magnets and superconductors at the fastest possible timescale and will allow the first study of transient triplet correlation in s-wave superconductors. The research carried in PICaSSO will lay the foundation for ultrafast superconducting spintronics and will pave the way towards the full integration of superconducting memory and logic devices.