Tailoring magnetic skyrmions in ultra-thin transition metal films
Tailoring magnetic skyrmions in ultra-thin transition metal films
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DOI：
10.1038/ncomms5030
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发表时间：
2014-06-01
影响因子：
16.6
通讯作者：
Heinze, Stefan
中科院分区：
文献类型：
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作者：
Dupe, Bertrand;Hoffmann, Markus;Heinze, Stefan
磁性材料中的Skyrmions为未来的自旋电子学应用提供了有吸引力的前景，因为它们是纳米尺度上拓扑稳定的自旋结构，可以用比移动畴壁所需的电流密度低几个数量级的电流密度来操纵。到目前为止，它们仅限于具有特定手性晶体对称性的大块磁体，这极大地限制了可用系统的数量及其性能的可调节性。最近，实验发现，磁性Skyrmion相也可以出现在超薄过渡金属薄膜的表面。在这里，我们提出了在这样的系统的基础上的第一性原理电子结构理论的skyrmions的理解。我们证明，过渡金属界面处磁skyrmion的性质（例如其直径和稳定性）可以通过界面的结构和组成来调整，并且在此类系统中需要超出微磁模型的描述。
Skyrmions in magnetic materials offer attractive perspectives for future spintronic applications since they are topologically stabilized spin structures on the nanometre scale, which can be manipulated with electric current densities that are by orders of magnitude lower than those required for moving domain walls. So far, they were restricted to bulk magnets with a particular chiral crystal symmetry greatly limiting the number of available systems and the adjustability of their properties. Recently, it has been experimentally discovered that magnetic skyrmion phases can also occur in ultra-thin transition metal films at surfaces. Here we present an understanding of skyrmions in such systems based on first-principles electronic structure theory. We demonstrate that the properties of magnetic skyrmions at transition metal interfaces such as their diameter and their stability can be tuned by the structure and composition of the interface and that a description beyond a micromagnetic model is required in such systems.