Fullerton J, Hierro-Rodriguez A, Donnelly C, Sanz-Hernández D, Skoric L, MacLaren D A, Fernández-Pacheco A
SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
Depto. Fisica, Universidad de Oviedo, Oviedo, Spain.
Nanotechnology. 2023 Jan 13;34(12). doi: 10.1088/1361-6528/aca9d6.
Cylindrical magnetic nanowires are promising systems for the development of three-dimensional spintronic devices. Here, we simulate the evolution of magnetic states during fabrication of strongly-coupled cylindrical nanowires with varying degrees of overlap. By varying the separation between wires, the relative strength of exchange and magnetostatic coupling can be tuned. Hence, we observe the formation of six fundamental states as a function of both inter-wire separation and wire height. In particular, two complex three-dimensional magnetic states, a 3D Landau Pattern and a Helical domain wall, are observed to emerge for intermediate overlap. These two emergent states show complex spin configurations, including a modulated domain wall with both Néel and Bloch character. The competition of magnetic interactions and the parallel growth scheme we follow (growing both wires at the same time) favours the formation of these anti-parallel metastable states. This works shows how the engineering of strongly coupled 3D nanostructures with competing interactions can be used to create complex spin textures.
圆柱形磁性纳米线是三维自旋电子器件开发中很有前景的体系。在此，我们模拟了具有不同重叠程度的强耦合圆柱形纳米线制造过程中磁态的演变。通过改变线间间距，可以调节交换耦合和静磁耦合的相对强度。因此，我们观察到六种基本状态的形成是线间间距和线高的函数。特别地，对于中等重叠情况，观察到两种复杂的三维磁态，即三维朗道模式和螺旋畴壁出现。这两种出现的状态显示出复杂的自旋构型，包括具有奈尔和布洛赫特征的调制畴壁。磁相互作用的竞争以及我们采用的平行生长方案（同时生长两根线）有利于这些反平行亚稳态的形成。这项工作展示了如何利用具有竞争相互作用的强耦合三维纳米结构工程来创建复杂的自旋纹理。
