卷起的单壁铁磁纳米膜中的有序化
Ordering in rolled-up single-walled ferromagnetic nanomembranes
摘要：
利用分析和数值方法，包括不同的应力诱导的各向异性，从理论上研究了纳米薄壁软磁纳米管和微米管（一个单一的加宽卷起的纳米膜）的磁化。在分析研究中，我们考虑静磁效应定性，有效的各向异性，而他们充分处理的微磁模拟（但仅限于亚微米直径的管）。周期性排序的基本类型已经建立，并在模拟中验证了它们在多晶坡莫合金和钴纳米管中的存在。磁畴结构基本上由材料沉积引起的螺旋应力或冷却引起的轴向应力通过体积磁致伸缩来确定，同时它也受磁荷分布的影响。此外，它取决于磁化过程的初始状态。
英文摘要：
Magnetization of soft-ferromagnetic nano- and microtubes of nanometer-thin walls (a single-widening rolled-up nanomembranes) is theoretically studied using analytical and numerical approaches including different stress-induced anisotropies. Within the analytical study, we consider magnetostatic effects qualitatively, with an effective anisotropy, while they are fully treated in the micromagnetic simulations (limited to the tubes of submicrometer diameters however). Basic types of the periodic ordering have been established and their presence in nanotubes of polycrystalline Permalloy and cobalt has been verified within the simulations. The domain structure is basically determined by a material-deposition-induced helical stress or a cooling-induced axial stress via the volume magnetostriction while it is influenced by the distribution of magnetic charges as well. Also, it is dependent on the initial state of the magnetization process.
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