High-Magnetization FeCo Nanochains with Ultrathin Interfacial Gaps for Broadband Electromagnetic Wave Absorption at Gigahertz

作者：Xuefeng Zhang, Yixing Li, Rongge Liu, Yi Rao, Huawei Rong, Gaowu Qin · 发表于：ACS Applied Materials & Interfaces · 年份：2016 · DOI：10.1021/acsami.5b12203 · 被引用次数：175 · 研究领域：Electromagnetic wave absorption materials、Metamaterials and Metasurfaces Applications、Advanced Antenna and Metasurface Technologies

Superparamagnetic FeCo nanochains consisting of assembled ∼25 nm nanoparticles and ∼1 nm gaps are synthesized by facial wet-chemical route and exhibit significant electromagnetic absorption at gigahertz. Both the dielectric and magnetic loss factors present dual-resonance behaviors at 2-18 GHz frequencies, originated from the asymmetric architecture of the cubic FeCo particles that assembled in a one-dimensional chain structure. Theoretical analyses uncover that the origins of the enhancement of electromagnetic losses are ascribed to the high magnetization (228 emu/g) and the ultrathin gaps (∼1 nm), which enhances the Snoek limit and induces anisotropic dielectric polarizations, consequently constructing a proper electromagnetic match.