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Rheologically Engineered 3D-Printed Highly Loaded Magneto-Dielectric Absorbers for Device-Level Electromagnetic
Yuheng Jiang1, Zihao Chen1, Xiao Sun2,3
1School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, People's Republic of China.
Nano-Micro Letters
|July 30, 2026
Summary
A novel 3D printing method enables high-performance magneto-dielectric absorbers using graphene and carbonyl iron powder. These gradient honeycomb structures offer broad bandwidth absorption and enhance terahertz devices.
Area of Science:
- Materials Science
- Electromagnetics
- Additive Manufacturing
Background:
- Magneto-dielectric composites offer strong electromagnetic loss but face processing challenges.
- Controlling geometry and processability is crucial for advanced composite applications.
Purpose of the Study:
- To develop a 3D printing strategy for high-load magneto-dielectric composites.
- To create tunable composite inks with improved rheological properties.
- To fabricate gradient honeycomb structures for electromagnetic absorption.
Main Methods:
- Rheologically engineered direct ink writing (DIW) 3D printing.
- Incorporation of graphene (Gr) to enhance ink properties.
- Construction of a synergistic magnetic-dielectric loss system with carbonyl iron powder (CIP).
Main Results:
- A tunable Gr/CIP composite ink was achieved with optimized CIP content (~84.06 wt%).
- High-fidelity 3D-printed gradient honeycomb structures exhibited excellent geometric fidelity and temporal stability.
- The GCH absorber demonstrated an effective absorption bandwidth of 18 GHz–4 THz with a minimum reflection loss of -84.30 dB at 2.6 mm thickness.
Conclusions:
- The DIW strategy provides a practical approach for fabricating complex magneto-dielectric structures.
- 3D-printed GCH absorbers show significant potential for terahertz applications, including reconfigurable intelligent surfaces (RIS).
- The developed absorbers enhance device performance, offering gains in main lobe enhancement and sidelobe suppression for communication, imaging, and radar systems.
