论文标题

薄膜多层薄膜中的Skyrmion晶格阶段

Skyrmion Lattice Phases in Thin Film Multilayer

论文作者

Zázvorka, Jakub, Dittrich, Florian, Ge, Yuquing, Kerber, Nico, Raab, Klaus, Winkler, Thomas, Litzius, Kai, Veis, Martin, Virnau, Peter, Kläui, Mathias

论文摘要

物质的阶段无处不在,包括固体和液体在内的日常示例。在缩小的维度中,发生特定阶段,例如二维(2D)六阶段和相应的相变。 2D有序系统的一个特别令人兴奋的例子是Skyrmion Lattices,与先前研究的2D胶体系统相比,Skyrmion的大小和密度可以通过温度和磁场来调节。这使我们能够将系统从液相转移到六角形阶的分析中推导出来。使用软盘的粗粒分子动力学模拟,我们确定了Skyrmion相互作用势,并发现模拟能够重现完整的二维相行为。这表明,不仅在简单的二维模型系统方面,天空的静态行为在质量上得到很好的描述,而且Skyrmion Lattices是多功能且可调的二维模型系统,可以在降低的尺寸中研究阶段和相变。

Phases of matter are ubiquitous with everyday examples including solids and liquids. In reduced dimensions, particular phases, such as the two-dimensional (2D) hexatic phase and corresponding phase transitions occur. A particularly exciting example of 2D ordered systems are skyrmion lattices, where in contrast to previously studied 2D colloid systems, the skyrmion size and density can be tuned by temperature and magnetic field. This allows us to drive the system from a liquid phase to a hexatic phase as deduced from the analysis of the hexagonal order. Using coarse-grained molecular dynamics simulations of soft disks, we determine the skyrmion interaction potentials and we find that the simulations are able to reproduce the full two-dimensional phase behavior. This shows that not only the static behavior of skyrmions is qualitatively well described in terms of a simple two-dimensional model system but skyrmion lattices are versatile and tunable two-dimensional model systems that allow for studying phases and phase transitions in reduced dimensions.

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