论文标题
通过聚焦He $^+$ - 离子辐照的确定性产生和引导运动的运动和引导运动
Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He$^+$-Ion Irradiation
论文作者
论文摘要
磁性天空是具有非平凡拓扑的准粒子，设想在下一代数据技术中发挥关键作用，同时由于其新兴拓扑费而引起了基本的研究兴趣。在手性磁多层中，可以使用电流产生的自旋轨道扭矩或超快激光激发，以对picsecond Timescale上的分离隔离天际来定核。然而，两种方法都会产生随机布置的天空，这固有地限制了将天空成核的位置的精度。在这里，我们表明，具有$^+$ $ - 离子光束的各向异性景观的纳米图案产生了定义明确的天际成核位点，从而将天空定位转换为确定性过程。这种方法可以实现对单个Skyrmion成核的控制以及具有纳米尺度精度的指导Skyrmion运动，这对于Skyrmion动力学和应用的未来基础研究都是关键的。
Magnetic skyrmions are quasiparticles with non-trivial topology, envisioned to play a key role in next-generation data technology while simultaneously attracting fundamental research interest due to their emerging topological charge. In chiral magnetic multilayers, current-generated spin-orbit torques or ultrafast laser excitation can be used to nucleate isolated skyrmions on a picosecond timescale. Both methods, however, produce randomly arranged skyrmions, which inherently limits the precision on the location at which the skyrmions are nucleated. Here, we show that nanopatterning of the anisotropy landscape with a He$^+$-ion beam creates well-defined skyrmion nucleation sites, thereby transforming the skyrmion localization into a deterministic process. This approach allows to realize control of individual skyrmion nucleation as well as guided skyrmion motion with nanometer-scale precision, which is pivotal for both future fundamental studies of skyrmion dynamics and applications.
