Materials with strong magnetic property that can provide excellent microwave absorption performance are highly desirable, especially if their dielectric and magnetic properties can be easily modulated, which make minimal thickness and ultrawide bandwidth become achievable. The magnetic properties of ferromagnetic (FM) and antiferromagnetic (AFM) composite materials are closely related to their ratio of composition, size, morphology, and structure. AFM–FM composites have become a popular alternative for microwave absorption; however, the controllable design and preparation need to be urgently optimized. Here, we have successfully prepared a series of platelike NiO–Ni composites and demonstrated the potential of such composites for microwave absorption. Strong magnetic coupling was found from NiO–Ni nanoparticles by electron holography, which makes NiO–Ni composites a highly efficient microwave absorber (strong reflection loss: −61.5 dB and broad bandwidth: 11.2 GHz, reflection loss < −10 dB). Our findings are helpful to develop a strong microwave absorber based on magnetic coupling.

中文翻译：

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通过反铁磁-铁磁界面的钉扎效应获得出色的NiO-Ni纳米板微波吸收剂

非常需要具有强磁性的，可提供出色的微波吸收性能的材料，尤其是如果可以轻松调节其介电和磁性，从而可以实现最小的厚度和超宽带宽的材料。铁磁（FM）和反铁磁（AFM）复合材料的磁性能与其成分，尺寸，形态和结构的比率密切相关。AFM–FM复合材料已成为微波吸收的流行替代方法。但是，可控的设计和准备工作亟待优化。在这里，我们成功地制备了一系列板状NiO-Ni复合材料，并证明了这种复合材料在微波吸收方面的潜力。通过电子全息图发现NiO-Ni纳米粒子具有强磁耦合，这使NiO-Ni复合材料成为高效的微波吸收剂（强反射损耗：-61.5 dB，宽带宽：11.2 GHz，反射损耗<-10 dB）。我们的发现有助于开发基于磁耦合的强微波吸收器。