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논문 기본 정보

저자정보
(Pusan National University) (Korea Institute of Materials Science) (Pusan National University) (Korea Institute of Materials Science)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.30 No.3
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    초록·키워드

    The demand for thin and broadband high-frequency electromagnetic wave absorbers has grown rapidly with the advancement of communication technologies. However, most conventional magnetic materials exhibit ferromagnetic resonance (FMR) at low frequencies, restricting their applicability in high-frequency ranges such as the K-band, which is widely used in 5G communication. In this study, Ni-Co-substituted Ba-W hexaferrites (BaNi<sub>2-x</sub>Co<sub>x</sub>Fe<sub>16</sub>O<sub>27</sub>) were synthesized via a citric acid-assisted sol–gel method combined with molten salt calcination to achieve single-phase formation at a reduced temperature of 1250 °C. By adjusting the Ni and Co substitution levels, the FMR frequency was effectively tuned within the 18–40 GHz range. The composite absorber with the optimized composition, BaNi<sub>1.4</sub>Co<sub>0.6</sub>Fe<sub>16</sub>O<sub>27</sub>, exhibited over 90% absorption efficiency across the entire K-band with a minimal thickness of 1.2 mm. This absorber outperforms many previously reported materials by offering wider bandwidth and thinner thickness. These findings highlight the suitability of Ni-Co- substituted Ba-W hexaferrites for next-generation communications.

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