Journal
NANO RESEARCH
Volume 16, Issue 1, Pages 1773-1778Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-5111-y
Keywords
one-dimensional micromagnets; hierarchical structure; microwave absorbing material; magnetic coupling; double-loss mechanisms
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This study successfully synthesized a magnetic microwave absorbing material (MAMs) using a hydrothermal method, and its composition and morphology were controlled by adjusting the atomic ratio. The MAMs showed enhanced microwave absorption in the C band, making it a potential solution for electromagnetic pollution in this frequency range.
Microwave absorbing materials (MAMs) has been intensively investigated in order to meet the requirement of electromagnetic radiation control, especially in S and C band. In this work, FeCo-based magnetic MAMs are hydrothermally synthesized via a magnetic-field-induced process. The composition and morphology of the MAMs are capable of being adjusted simultaneously by the atomic ratio of Fe2+ to Co2+ in the precursor. The hierarchical magnetic microchain, which has a core-shell structure of two-dimensional FexCo1-xOOH nanosheets anchored vertically on the surface of a one-dimensional (1D) Co microchain, shows significantly enhanced microwave absorption in C band, resulting in a reflection loss (R-L) of lower than -20 dB at frequencies ranging from 4.4 to 8.0 GHz under a suitable matching thickness. The magnetic coupling of Co microcrystals and the double-loss mechanisms out of the core-shell structure are considered to promote the microwave attenuation capability. The hierarchical design of 1D magnetic MAMs provides a feasible strategy to solve the electromagnetic pollution in C band.
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