微波食品加热
毫米
极高频率
窗口(计算)
带宽(计算)
材料科学
共振(粒子物理)
吸收(声学)
光电子学
光学
电信
物理
计算机科学
原子物理学
操作系统
作者
Chuyang Liu,Li Xu,Xueyu Xiang,Yujing Zhang,Liming Zhou,Bo Ouyang,Fan Wu,Dong-Hyun Kim,Guangbin Ji
标识
DOI:10.1007/s40820-024-01395-4
摘要
Abstract The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range, posing increasingly severe challenges in terms of electromagnetic pollution prevention and radar stealth. However, existing millimeter-wave absorbers are still inadequate in addressing these issues due to their monotonous magnetic resonance pattern. In this work, rare-earth La 3+ and non-magnetic Zr 4+ ions are simultaneously incorporated into M-type barium ferrite (BaM) to intentionally manipulate the multi-magnetic resonance behavior. By leveraging the contrary impact of La 3+ and Zr 4+ ions on magnetocrystalline anisotropy field, the restrictive relationship between intensity and frequency of the multi-magnetic resonance is successfully eliminated. The magnetic resonance peak-differentiating and imitating results confirm that significant multi-magnetic resonance phenomenon emerges around 35 GHz due to the reinforced exchange coupling effect between Fe 3+ and Fe 2+ ions. Additionally, Mössbauer spectra analysis, first-principle calculations, and least square fitting collectively identify that additional La 3+ doping leads to a profound rearrangement of Zr 4+ occupation and thus makes the portion of polarization/conduction loss increase gradually. As a consequence, the La 3+ –Zr 4+ co-doped BaM achieves an ultra-broad bandwidth of 12.5 + GHz covering from 27.5 to 40 + GHz, which holds remarkable potential for millimeter-wave absorbers around the atmospheric window of 35 GHz.
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