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Achieving Ultra-Broad Microwave Absorption Bandwidth Around Millimeter-Wave Atmospheric Window Through an Intentional Manipulation on Multi-Magnetic Resonance Behavior |
Chuyang Liu1, Lu Xu1, Xueyu Xiang1, Yujing Zhang2( ), Li Zhou1, Bo Ouyang3( ), Fan Wu4,6, Dong-Hyun Kim5, Guangbin Ji1( ) |
1 School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, Jiangsu, People’s Republic of China 2 School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, People’s Republic of China 3 School of Physics, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, People’s Republic of China 4 School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, People’s Republic of China 5 School of Physics, Chungbuk National University, Cheongju, 28644, South Korea 6 Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, People’s Republic of China |
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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 La3+ and non-magnetic Zr4+ ions are simultaneously incorporated into M-type barium ferrite (BaM) to intentionally manipulate the multi-magnetic resonance behavior. By leveraging the contrary impact of La3+ and Zr4+ 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 Fe3+ and Fe2+ ions. Additionally, Mössbauer spectra analysis, first-principle calculations, and least square fitting collectively identify that additional La3+ doping leads to a profound rearrangement of Zr4+ occupation and thus makes the portion of polarization/conduction loss increase gradually. As a consequence, the La3+-Zr4+ 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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Received: 08 February 2024
Published: 22 April 2024
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Corresponding Authors:
Yujing Zhang, Bo Ouyang, Guangbin Ji
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Fig. 1 a Preparation flow chart, b SEM images, c rietveld refinement of XRD and d XPS spectra for Fe 2p and O 1s of the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2
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Table 1 Lattice constants a, c and cell volumes of LaxBa1-xZr0.3Fe11.7O19 (x = 0-0.2) x | a (Å) | c (Å) | V (Å)3 | 0 | 5.904 | 23.313 | 703.862 | 0.1 | 5.902 | 23.299 | 703.036 | 0.2 | 5.898 | 23.265 | 700.912 |
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Table 1 Lattice constants a, c and cell volumes of LaxBa1-xZr0.3Fe11.7O19 (x = 0-0.2)
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Table 2 Fe2+ and oxygen vacancy contents of LaxBa1-xZr0.3Fe11.7O19(x = 0-0.2) x | Y | C(Fe2+) (%) | C(OV) (%) | 0 | 0.3 | 37.44 | 29.30 | 0.1 | 0.3 | 38.89 | 36.54 | 0.2 | 0.3 | 41.36 | 37.32 |
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Table 2 Fe2+ and oxygen vacancy contents of LaxBa1-xZr0.3Fe11.7O19(x = 0-0.2)
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Fig. 2 a Lattice structure diagram of BaM, b Raman patterns, c Mössbauer spectra, d parameters of occupation area, I.S., Q.S., Hhf deduced from Mössbauer spectra of the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2 and e theoretical calculations of enthalpy for the La3+ and Zr4+ co-doped barium ferrite with Zr4+ substituting for Fe3+ at various sites based on first principles
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Fig. 3 a Hysteresis loops, b fitting of the hysteresis loops by law of approach to saturation, c obtained Ms, Ha, Hc values of the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2, d schematic diagram of spin orbit coupling effect, e real and imaginary parts of complex permeability, f Cole-Cole circles, g magnetic resonance peak-differentiating and imitating of the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2 and (h) schematic diagram of the exchange coupling between Fe3+ and Fe2+ ions
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Fig. 4 a The real and imaginary parts of complex permittivity, b Cole-Cole circles, c conduction loss/polarization loss portion obtained by least square fitting of the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2, d schematic diagram of diminished conduction loss mechanism and e schematic diagram of various dipoles in the La3+ and Zr4+ co-doped barium ferrite
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Fig. 5 a 3D reflection loss values versus frequency and thickness, b 2D reflection loss and impedance matching values of the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2 and c schematic diagram illustrating the effects of La3+ and Zr4+ ions on natural resonance frequency
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Fig. 6 a Model diagram and b results diagram of near-field simulation, c model diagram and d results diagram of far-field simulation and e RSC values in the range of 0° ~ 360° for the LaxBa1-xZr0.3Fe11.7O19 samples with x = 0, 0.1, 0.2
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