Magnetic carbon-based composites reside at the frontier of high-performance microwave absorbing materials (MAMs) due to their dual loss mechanisms and tunable electromagnetic properties. In this study, we review the construction of magnetic carbon-metal composites in recent years, and introduce a facile citrate-derived strategy to produce FeCo alloy/carbon composites through a direct pyrolysis of the resultant gels, where citric acid is employed as both a carbon source and a complexing agent. It is found that the dosage of citric acid determines the crystalline phase and particle size of magnetic FeCo alloy particles, as well as the content of carbon components. Electromagnetic analysis indicates that the electromagnetic functions of these composites are highly dependent on their specific compositions, where carbon components favor high complex permittivity and FeCo alloy particles take charge of complex permeability. When the chemical composition is optimized, good attenuation ability and characteristic impedance matching are created in the composite, resulting in desirable microwave absorption properties. The absorption performance is comparable to most homologous composites reported. Considering the low-cost and easy preparative process, we believe that this citrate-derived strategy may be instructive and helpful for practical applications of various magnetic carbon-based composites in the field of microwave absorption.

磁性碳基复合材料因其双重损耗机制和可调节的电磁特性而位于高性能微波吸收材料（MAM）的前沿。在这项研究中，我们回顾了近年来磁性碳-金属复合材料的构造，并介绍了一种通过柠檬酸直接作为原料，通过直接热解所得凝胶，从柠檬酸盐衍生的策略来生产FeCo合金/碳复合材料的方法。碳源和络合剂。发现柠檬酸的剂量决定了磁性FeCo合金颗粒的晶相和粒径，以及碳组分的含量。电磁分析表明，这些复合材料的电磁功能高度依赖于它们的特定组成，其中碳组分有利于高复介电常数，而FeCo合金颗粒负责复磁导率。优化化学成分后，复合材料会产生良好的衰减能力和特性阻抗匹配，从而产生理想的微波吸收性能。吸收性能与报道的大多数同源复合物相当。考虑到低成本和易于制备的过程，我们认为这种柠檬酸盐衍生的策略可能对微波吸收领域中各种磁性碳基复合材料的实际应用具有指导意义和帮助。产生理想的微波吸收性能。吸收性能与报道的大多数同源复合物相当。考虑到低成本和易于制备的过程，我们认为这种柠檬酸盐衍生的策略可能对微波吸收领域中各种磁性碳基复合材料的实际应用具有指导意义和帮助。产生理想的微波吸收性能。吸收性能与报道的大多数同源复合物相当。考虑到低成本和易于制备的过程，我们认为这种柠檬酸盐衍生的策略可能对微波吸收领域中各种磁性碳基复合材料的实际应用具有指导意义和帮助。