Journal
ADVANCED ELECTRONIC MATERIALS
Volume 7, Issue 3, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202000970
Keywords
dielectric resonance; magnetic resonance; electromagnetic wave absorption; Ni wire arrays
Funding
- National Natural Science Foundation of China [51971008, U1832138, 51920105001, 51671010]
- Fundamental Research Funds for the Central Universities
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This paper introduces a novel ultralight and ultrathin EMW absorber based on a parallel Ni wire array, and proposes an orientation-enhanced strategy to improve absorption performance. The study found that the parallel orientation of wires can enhance interfacial polarization, improve dielectric and magnetic losses, and enhance impedance matching. The parallel Ni wire array exhibits excellent EMW absorption and achieves the largest specific reflection loss among magnetic wire-based absorbers.
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 x loading)) among magnetic wire-based absorbers.
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