Electromagnetic Absorption by Magnetic Oxide Nanomaterials: A Review

With the rapid development of electronic equipment and communication technology, radiation pollution caused by electromagnetic waves has become a serious social nuisance. Based on this, the development of high-performance electromagnetic wave-absorbing materials has become a research hotspot. Among them, Fe₃O₄, as a traditional ferrite-based wave-absorbing material, has the advantages of abundant natural resources, low environmental pollution, and deep wave-absorbing strength. Therefore, the direct utilization of Fe₃O₄ as a wave-absorbing material or as a raw material for the preparation of wave-absorbing materials has become a research direction for researchers. This paper first introduces the basic theories and evaluation parameters related to wave absorption and then reviews the research progress of pure Fe₃O₄ wave-absorbing materials with key structural dimensions below 500 nm and related composite wave-absorbing materials by summarizing the reports of electromagnetic wave-absorbing materials related to Fe₃O₄ in recent years. Finally, the development prospect of Fe₃O₄-based wave-absorbing materials is introduced.