In order to overcome the inherent trade-off between magnetic absorber's effective absorption, filling concentration, and thickness while achieving real-time control over the effective absorption bandwidth (EAB) below −10 dB, periodic magnetically oriented gradient structures featuring flower-like surfaces that can be reconfigured using magnetic induction technology. The arch test results demonstrated that even with particle filling concentration of only 30 wt%, reflection loss (RL) of the magnetically oriented periodic gradient structures achieved −37.5 dB, and EAB could be extended to 6.5 GHz, outperforming samples 60 wt%–0 mT. Especially for samples 50 wt%–100 mT, which EAB with four distinct peaks in its EAB reaching 10.5 GHz. This was due to magnetically-oriented macro–micro structure that facilitated to reduce hyperosmotic threshold of conductive loss network of absorbing material. Meanwhile, the gradient structure with flower-like surface was conducive to absorption peaks, impedance matching patterns and electromagnetic wave scattering. The reconfigurable structure was also found to have remarkably stability, maintaining its nearly uniform electromagnetic loss capability even after 3 months. This study is scientifically important for establishing the regulatory mechanism of orientation distribution structure on EAB and absorption resonance peaks, as well as providing an experimental and theoretical foundation for exploring low detectable and electromagnetic protection devices.

中文翻译：

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具有花状表面的周期性磁定向梯度结构可提高微波吸收效率

为了克服磁吸收体的有效吸收、填充浓度和厚度之间固有的权衡，同时实现有效吸收带宽（EAB）低于-10 dB的实时控制，具有花状表面的周期性磁定向梯度结构可以使用磁感应技术重新配置。拱形测试结果表明，即使颗粒填充浓度仅为30 wt%，磁定向周期性梯度结构的反射损耗（RL）也达到-37.5 dB，并且EAB可以扩展到6.5 GHz，优于60 wt%–0的样品公吨。特别是对于 50 wt%–100 mT 的样品，其 EAB 中有四个不同的峰值，达到 10.5 GHz。这是由于磁性取向的宏观微观结构有助于降低吸收材料的传导损耗网络的高渗阈值。同时，花状表面的梯度结构有利于吸收峰、阻抗匹配模式和电磁波散射。该可重构结构还被发现具有显着的稳定性，即使在 3 个月后仍保持其几乎均匀的电磁损耗能力。该研究对于建立EAB取向分布结构和吸收共振峰的调控机制具有重要的科学意义，也为探索低可检测和电磁防护器件提供了实验和理论基础。