Soft magnetic micro/nanostructures are highly desirable for pursuing excellent magnetic properties and electromagnetic wave (EMW) absorption performance. However, their magnetic loss at high frequency is usually very low due to the sharp drop of permeability, and thus results in a heavy loading in matrix and a large layer thickness, which are not conductive to the development of ultralight and ultrathin EMW absorbers. Here, an ultralight and ultrathin EMW absorber based on a parallel Ni wire array are reported, and an orientation‐enhanced strategy to improve EMW absorption performance is proposed. Combining with the finite element simulation, it is found that the parallel orientation of Ni wires with a capacitor‐like structure enhances the interfacial polarization, thereby improving dielectric loss. The strong shape anisotropy caused by orientation increases magnetic loss by enhancing magnetic resonances, which further improves impedance matching. The parallel Ni wire array exhibits excellent EMW absorption and achieves the largest specific reflection loss (reflection loss/(thickness × loading)) among magnetic wire‐based absorbers.

中文翻译：

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平行取向诱导的强共振使镍亚微米线阵列成为可能：超薄和超轻的电磁波吸收材料

为了获得优异的磁性能和电磁波（EMW）吸收性能，非常需要软磁微/纳米结构。然而，由于磁导率的急剧下降，它们在高频下的磁损耗通常非常低，因此导致基质中的重负荷和较大的层厚度，这不利于超轻和超薄EMW吸收剂的发展。在此，报道了一种基于平行镍线阵列的超轻超薄EMW吸收器，并提出了一种改善EMW吸收性能的取向增强策略。结合有限元模拟，发现具有电容器状结构的镍丝平行取向增强了界面极化，从而改善了介电损耗。由取向引起的强形状各向异性通过增强磁共振来增加磁损耗，这进一步改善了阻抗匹配。平行镍线阵列表现出优异的EMW吸收率，并在基于电磁线的吸收剂中实现最大的比反射损耗（反射损耗/（厚度×负载））。