The development of broadband and high-efficiency electromagnetic wave absorbing materials in the gigahertz is highly crucial and challenging. Here, typical magnetic-carbon composites were successfully obtained, which involves a controlled reduction process from a semiconductor to magnetic materials under reducing atmosphere. Due to the huge difference in lattice constants, yolk-shell Fe₃O₄@C and [email protected]@C powders were developed from core-shell a-Fe₂O₃@PDA precursor. The chemical composition, magnetic property, and morphology of the final [email protected]@C powders were discussed comprehensively. Related electromagnetic parameters of all samples were tested to analyze the storage and loss ability toward electromagnetic wave energy. Inspiringly, both the Fe₃O₄@C and [email protected]@C composites exhibited high-performance energy absorption in the microwave band. The minimal reflection loss (RL_min) value of Fe₃O₄@C is -45.4 dB at the absorber thickness only at 1.5 mm and the efficient absorption (RL≤-10 dB) frequency up to 5.5 GHz at 2.0 mm thickness. Meanwhile, the RL_min value of [email protected]@C is -66.5 dB at the absorber thickness of only 1.6 mm and show broadband responding arrange, covering almost all the Ku-band. The synthesized magnetic-carbon composites display excellent electromagnetic properties and high-efficient energy conversion behaviors, meeting to the high requirements for modern microwave absorption materials.

千兆赫兹宽带和高效电磁波吸收材料的开发是至关重要的和具有挑战性的。在这里，成功地获得了典型的磁性碳复合材料，其中涉及在还原气氛下从半导体到磁性材料的受控还原过程。由于晶格常数的巨大差异，从核壳a-Fe ₂ O ₃制备了卵黄壳Fe ₃ O ₄ @C和[电子邮件保护] @C粉末。@PDA前体。最终讨论了[电子邮件保护的] @C最终粉末的化学成分，磁性和形貌。测试了所有样品的相关电磁参数，以分析其对电磁波能量的存储和损耗能力。令人鼓舞的是，Fe ₃ O ₄ @C和[电子邮件保护] @C复合材料在微波波段均表现出高性能的能量吸收。Fe ₃ O ₄ @C的最小反射损耗（RL _min）值在1.5 mm的吸收层厚度下为-45.4 dB，在2.0 mm的厚度下有效吸收频率（RL≤-10dB）高达5.5 GHz。同时，RL_分钟在仅1.6 mm的吸收体厚度下，[email protected] @C的值是-66.5 dB，并显示出宽带响应排列，几乎覆盖了所有Ku频段。合成的磁性碳复合材料显示出优异的电磁性能和高效的能量转换性能，满足了现代微波吸收材料的高要求。