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• W3129363609 abstract "In order to obtain a light-weight, stable, and cost-effective yet efficient electromagnetic (EM) wave absorbing material, here, we investigated EM wave attenuation properties of as-synthesized low-density MnFe2O4 nano-hollow spheres (NHS) in-detail, varying their sizes [mean diameter (in nm) of sample sets = 100, 220, 300, 450, and 550] within a widely used frequency range of 1–20 GHz. In addition to larger interfacial area and magnetic anisotropy of NHSs, multiple internal reflections in its hollow core promote better EM wave absorption. Therefore, tuning of NHS sizes is demonstrated as an effective strategy to achieve an excellent microwave absorber, and MnFe2O4 NHS of diameter ∼450 nm is found to exhibit a maximum reflection loss (RL) of approximately −52.6 dB, total shielding efficiency (SETotal) of approximately −39.5 dB, and a high attenuation constant (α) of ∼285 Np/m due to best impedance matching, |Zin/Z0| ∼ 1, along with significant dielectric and magnetic losses. Furthermore, a thickness-dependent study on 450 nm NHS composites reveals that optimum RL reached approximately −55.4 dB at 9.6 GHz for t = 5.1 mm with a broad total effective bandwidth (RL &lt; −10 dB, i.e., attenuation &gt;90%) of ∼3.7 GHz. Moreover, the analysis from the quarter-wavelength model for best matching thickness (tm) displays a good agreement between experimental and calculated tm values. This study presents optimized 450 nm MnFe2O4 NHS at much lower filler concentration (only 20 wt. % in the epoxy resin matrix) as a highly promising low-cost and light-weight microwave absorber suitable for practical high-frequency applications." @default.
• W3129363609 created "2021-03-01" @default.
• W3129363609 creator A5000888164 @default.
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• W3129363609 date "2021-02-17" @default.
• W3129363609 modified "2023-10-17" @default.
• W3129363609 title "Enhancement of electromagnetic wave absorption in MnFe2O4 nano-hollow spheres" @default.
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• W3129363609 doi "https://doi.org/10.1063/5.0039560" @default.
• W3129363609 hasPublicationYear "2021" @default.
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