Anisotropy-induced depinning in the Zn-substituted skyrmion host Cu 2 O Se O 3
Anisotropy-induced depinning in the Zn-substituted skyrmion host Cu 2 O Se O 3
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Zn 取代的斯格明子主体 Cu 2 O Se O 3 中各向异性诱导的脱钉
DOI：
10.1103/physrevb.102.104424
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发表时间：
2020
影响因子：
3.7
通讯作者：
Birch M
中科院分区：
文献类型：
--
作者：
Birch M
磁skyrmions是纳米级的拓扑自旋纹理稳定的磁能项的微妙平衡。Skyrmion宿主材料的潜在晶体结构的化学取代提供了一种操纵这些能量贡献的途径，但也引入了额外的效应，如无序和钉扎。虽然掺杂和无序的影响已经在B20金属材料中得到了很好的研究，但磁电绝缘体中化学取代的后果尚未得到充分研究。在这项工作中，我们利用相结合的交流磁强计和小角中子散射研究的磁相变动力学在原始和锌取代。结果表明，一级螺旋-锥形相变表现出两种热分离的行为区域：在高温下，螺旋畴和锥形畴通过大尺度的连续旋转转变，而在低温下，两相共存.值得注意的是，在取代的样品中的钉扎的效果是不太普遍的低温相比，高温下，尽管可用的热活化能的减少。我们将这种行为归因于大的，温度依赖性，立方各向异性独特的，它变得足够强大，以克服在低温下的钉扎能。考虑和进一步探索这些影响将是至关重要的工程skyrmion材料对未来的应用。
Magnetic skyrmions are nanosized topological spin textures stabilized by a delicate balance of magnetic energy terms. The chemical substitution of the underlying crystal structure of skyrmion-hosting materials offers a route to manipulate these energy contributions but also introduces additional effects such as disorder and pinning. While the effects of doping and disorder have been well studied in B20 metallic materials such asand, the consequences of chemical substitution in the magnetoelectric insulatorhave not been fully explored. In this work we utilize a combination of AC magnetometry and small-angle neutron scattering to investigate the magnetic phase transition dynamics in pristine and Zn-substituted. The results demonstrate that the first-order helical-conical phase transition exhibits two thermally separated behavioral regimes: at high temperatures, the helical and conical domains transform by large-scale, continuous rotations, while at low temperatures, the two phases coexist. Remarkably, the effects of pinning in the substituted sample are less prevalent at low temperatures compared to high temperatures, despite the reduction of available thermal activation energy. We attribute this behavior to the large, temperature-dependent, cubic anisotropy unique to, which becomes strong enough to overcome the pinning energy at low temperatures. Consideration and further exploration of these effects will be crucial when engineering skyrmion materials towards future applications.