Broadband microwave absorption of CoNi@C nanocapsules enhanced by dual dielectric relaxation and multiple magnetic resonances

被引：236

作者：

Wang, Han ^{[1
]}

Dai, Yingying

Gong, Wenjie

Geng, Dianyu

Ma, Song

Li, Da

Liu, Wei

Zhang, Zhidong

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 22期

基金：

中国国家自然科学基金;

关键词：

FERROMAGNETIC-RESONANCE; NANOPARTICLES; PARTICLES; ABSORBERS;

D O I：

10.1063/1.4809675

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Dual dielectric relaxation of the permittivity and multiple magnetic resonances of the permeability (including one natural resonance and two exchange resonance modes) are observed in CoNi@C nanocapsules in the same 5-17GHz frequency range which leads to a better electromagnetic-wave absorption than earlier reported for nanocomposites. A reflection loss (RL) exceeding -25 dB is obtained in a wide frequency range of 5-17 GHz when an appropriate absorber thickness between 2 and 4.8mm is chosen. For a 2mm absorber layer, a RL value exceeding -10 dB is achieved in the broad frequency range 12-18 GHz, which covers the whole K-u-band. (C) 2013 AIP Publishing LLC.

引用

页数：4

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