Picosecond superconductivity-driven spin-torques

由于传输比特时没有欧姆损耗，与传统半导体逻辑相比，超导逻辑在计算能力和能耗方面都有了显著的改进。然而，由于缺乏与超导逻辑相结合的合适的低温存储器，这些优点大多被否定了。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和磁性合作的新途径，使基于自旋、电荷和超导相相干之间相互作用的新器件概念成为可能。这包括在超导等效的巨型磁阻阀中演示超低能量磁读出。毕加索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，通过直接产生于超导相关的转矩来实现磁体的皮秒开关。为了实现这一愿景，毕加索采用了时间分辨的方法，拍摄不同混合磁超导结构中自旋和超导之间的相互作用，其时间分辨率与它们的基本相互作用时间相当。这将使磁体和超导体在尽可能快的时间尺度上耦合，并将使s波超导体中瞬态三重态相关的首次研究成为可能。在毕加索号上进行的研究将为超高速超导自旋电子学奠定基础，并将为超导存储器和逻辑器件的完全集成铺平道路。

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.