Magneto-electric integrated design strategy of NiCo@C composites for synergistic absorption and conversion in mid-high frequency microwaves

Achieving synergistic absorption of electromagnetic waves (EMWs) in the mid-high frequency and absorption band conversion is an urgent problem. However, the present solution is usually a straightforward mixture of magnetic component-carbon component. Hereby, we optimize the magnetic properties and electrical relaxation response from a chemical synthesis perspective. Through integrated design, the contents of carbon components and multi-dimensional morphology are controlled by retaining strong magnetic properties. The morphology design and the construction of heterogeneous interfaces will boost the intense response of charge in the surrounding to enhance the polarization effect. The multi-dimensional structure and electromagnetic (EM) properties of the sample after optimized engineering have an extremely powerful absorption conversion effect on EMW energy. NiCo@C particles ultimately achieve synergistic absorption effects at low thickness (d < 3.5 mm) at middle frequencies (6–10 GHz) and high frequencies (10.5–18 GHz). Our work establishes a correlation mechanism between the physical and chemical properties of materials and EM parameters. It also provides insight into the synergistic absorption of EMWs in the mid-high frequency and absorption band conversion strategies.