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논문 기본 정보

자료유형
학술저널
저자정보
Young-Min Kang (Korea National University of Transportation) Jin-Young You (Korea National University of Transportation) Sang-Min Lee (Korea National University of Transportation)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.27 No.3
발행연도
2022.9
수록면
286 - 292 (7page)
DOI
10.4283/JMAG.2022.27.3.286

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초록· 키워드

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Ni-substituted Z-type hexaferrites with the chemical formula Sr₃Co<SUB>2-x</SUB>Ni<SUB>x</SUB>Fe<SUB>24</SUB>O<SUB>41</SUB> (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared by solid-state reaction processes. XRD analysis revealed that nearly a single Z-type hexaferrite phase could be obtained for the samples with Ni substitution x ≤ 0.5 when the samples were twice calcined at 1160 and 1235 °C, respectively, in air. The complex permittivity (ε", ε") and permeability (μ", μ") spectra (100 MHz ≤ f ≤ 18 GHz) and electromagnetic (EM) wave absorption properties were studied on Sr₃Co<SUB>2-x</SUB>NixFe<SUB>24</SUB>O<SUB>41</SUB> (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) powder-epoxy (10 wt%) composites. The permeability spectra continuously shifted to a lower frequency with an increase in x, owing to the decrease in the magnetocrystalline anisotropy. The peak frequency of μ" gradually decreased from 3.2 GHz to 2.0 GHz, and in turn, it shifted the corresponding EM absorption frequency range. The frequency corresponding to the minimum RL peak point also decreased from 3.3 GHz to 2.3 GH with an increase in x from 0 to 0.5. All the samples exhibited the lowest reflection loss of < -40 dB at the optimized frequency and thickness. The study shows that Ni substitution is very effective for the delicate tuning of electromagnetic absorption frequency in S-band (2-4 GHz).

목차

1. Introduction
2. Experimental Procedure
3. Results and Discussion
4. Conclusions
References

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