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

作者：Zhang, Xuefeng^*; Li, Yixing; Liu, Rongge; Rao, Yi; Rong, Huawei; Qin, Gaowu^*

来源：ACS Applied Materials & Interfaces, 2016, 8(5): 3494-3498.

DOI：10.1021/acsami.5b12203

• FeCo
• electromagnetic
• microwave absorption
• dielectric
• magnetization

Superparamagnetic FeCo nanochains consisting of assembled similar to 25 nm nanoparticles and similar to 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 (similar to 4 nm), which enhances the Snoek limit and induces anisotropic dielectric polarizations, consequently constructing a proper electromagnetic match.

• 出版日期2016-2-10
• 单位东北大学