Magnetic skyrmions are nanoscale topological spin structures offering great promise for next-generation information storage technologies. The recent discovery of sub-100-nm room-temperature (RT) skyrmions in several multilayer films has triggered vigorous efforts to modulate their physical properties for their use in devices. Here we present a tunable RT skyrmion platform based on multilayer stacks of Ir/Fe/Co/Pt, which we study using X-ray microscopy, magnetic force microscopy and Hall transport techniques. By varying the ferromagnetic layer composition, we can tailor the magnetic interactions governing skyrmion properties, thereby tuning their thermodynamic stability parameter by an order of magnitude. The skyrmions exhibit a smooth crossover between isolated (metastable) and disordered lattice configurations across samples, while their size and density can be tuned by factors of two and ten, respectively. We thus establish a platform for investigating functional sub-50-nm RT skyrmions, pointing towards the development of skyrmion-based memory devices.

中文翻译：

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Ir / Fe / Co / Pt多层膜中的可调谐室温磁性天文离子

磁性天生离子是纳米级的拓扑自旋结构，为下一代信息存储技术提供了广阔的前景。最近在几层多层膜中发现了低于100纳米的室温（RT）天生离子，这引发了人们的积极努力，以调节其物理性能以用于设备中。在这里，我们介绍了一个基于Ir / Fe / Co / Pt多层堆叠的可调谐RT天窗离子平台，我们使用X射线显微镜，磁力显微镜和霍尔传输技术对其进行了研究。通过改变铁磁层的成分，我们可以调整控制天生离子性质的磁相互作用，从而将它们的热力学稳定性参数调整一个数量级。天体离子在样品之间的隔离（易变）和无序晶格配置之间显示出平滑的交叉，而它们的大小和密度可以分别通过2倍和10倍进行调整。因此，我们建立了一个用于研究功能性50纳米以下RT天体离子的平台，旨在开发基于天体离子的存储设备。