论文标题
基于双向磁纹理的介镜超导记忆
Mesoscopic superconducting memory based on bistable magnetic textures
论文作者
论文摘要
随着不断增加的能量需要处理大数据，低功率计算技术（例如超导逻辑和记忆）的实现已成为一个紧迫的问题。但是，开发快速和非易失性的超导记忆元素仍然是一个挑战。超导体 - 铁磁性混合设备提供了有前途的解决方案，因为它们将旋转的超快速操纵与无耗散读数结合在一起。在这里，我们提出了一种新型的非挥发性约瑟夫森连接记忆，该记忆利用单个中镜铁磁铁的双向磁纹理。我们使用微磁模拟设计由NB/CO BiLayer构成的椭圆形平面连接。可以在零施加的场上以均匀磁化的形式制备椭圆形，也可以用作零的涡流。这两个状态产生的临界电流大为不同，从而实现了该元素的可靠电读数。我们描述了通过应用数值计算来量化铁磁体的局部流浪场来描述用于控制临界电流的机制，从而改变了超导干扰模式。通过将微磁性建模与可双向自旋纹理的连接结合在一起，我们的方法提出了一种实现超导记忆应用的新途径。
With the ever-increasing energy need to process big data, the realization of low-power computing technologies, such as superconducting logic and memories, has become a pressing issue. Developing fast and non-volatile superconducting memory elements, however, remains a challenge. Superconductor-ferromagnet hybrid devices offer a promising solution, as they combine ultra-fast manipulation of spins with dissipationless readout. Here, we present a new type of non-volatile Josephson junction memory that utilizes the bistable magnetic texture of a single mesoscopic ferromagnet. We use micromagnetic simulations to design an ellipse-shaped planar junction structured from a Nb/Co bilayer. The ellipse can be prepared as uniformly magnetized or as a pair of vortices at zero applied field. The two states yield considerably different critical currents, enabling reliable electrical readout of the element. We describe the mechanism used to control the critical current by applying numerical calculations to quantify the local stray field from the ferromagnet, which shifts the superconducting interference pattern. By combining micromagnetic modeling with bistable spin-textured junctions, our approach presents a novel route towards realizing superconducting memory applications.
