4.4 Article

Tuning of electromagnetic wave absorbing properties in Fe-deficient SrFe9.6-xCo1.2Ti1.2O19 hexaferrite-epoxy composites

期刊

CURRENT APPLIED PHYSICS
卷 31, 期 -, 页码 99-104

出版社

ELSEVIER
DOI: 10.1016/j.cap.2021.08.002

关键词

Hexaferrite; Permittivity; Permeability; Ferromagnetic resonance; Reflection loss; EM absorption

资金

  1. Research Fund of the Basic Science Research Program through the National Research Foundation of Korea - Ministry of Science and ICT [2017R1C1B2002394]
  2. Basic Science Research Capacity Enhancement Project (National Research Facilities and Equipment Center) through the Korea Basic Science Institute - Ministry of Education [2019R1A6C1010047]
  3. National Research Foundation of Korea [2017R1C1B2002394] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The research reported on the tunable electromagnetic wave absorption properties of Fe-deficient SrFe9.6-xCo1.2Ti1.2O19 hexaferrite-epoxy composites. As the Fe content decreased with increasing x, the ferromagnetic resonance (FMR) frequency also decreased gradually, leading to changes in the electromagnetic absorption frequency range.
We report the tunable electromagnetic (EM) wave absorption properties of Fe-deficient SrFe9.6-xCo1.2Ti1.2O19 hexaferrite-epoxy composites. SrFe9.6-xCo1.2Ti1.2O19 hexaferrite powders were prepared via solid-state reaction routes. It was observed that Sr-Ti-rich second phases were formed as x increased, i.e., the Fe content decreased. The ferromagnetic resonance (FMR) frequency of the composites gradually decreased from 8.8 GHz to 4.8 GHz with increasing x, and accordingly, the EM absorption frequency range also gradually changed. The gradual FMR frequency shift was attributed to the compositional shift in the mother phase. It is predicted that the Fe deficiency caused a decrease in the magnetocrystalline anisotropy, and in turn, it shifted the FMR frequency and modified the corresponding EM absorbing properties. All the samples demonstrated a high EM absorption performance with the lowest reflection loss of < -40 dB at the optimized frequency and thickness.

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