Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 517, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2020.167397
Keywords
Hexaferrite; Permittivity; Permeability; Ferromagnetic resonance; Reflection loss; EM absorption
Funding
- Hyundai NGV Company, Korea
- National Research Foundation of Korea - Ministry of Science and ICT [2017R1C1B2002394]
- 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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La-Co-Ti substituted Sr-hexaferrite powder-epoxy composites were fabricated for electromagnetic wave absorption. The electromagnetic absorption frequency range can be controlled by varying the substitution x, leading to high EM absorbing performances suitable for X band and millimeter range applications.
La-Co-Ti substituted Sr-hexaferrite, Sr0.906La0.094Fe11-2xCoxTixO19 (x = 0.8, 1.0, 1.2, 1.4) powder-epoxy (10 wt%) composites were fabricated for electromagnetic wave (EM) absorption application. Single M-type hexaferrite phase was confirmed by X-ray diffraction analysis for all the samples. Both saturation magnetization and coercivity of the composites decrease with increase of Co-Ti substitution x. Reflection loss (RL) of the hexaferrite powder-epoxy composites were calculated using their complex permittivity and permeability data. The EM absorbing frequency range is controlled by the substitution x because the ferromagnetic resonance (FMR) frequency of the samples is systematically varied following Snoek's limit law. The hexaferrite sample with x = 1.2 is suitable for use as an X band (8-12 GHz) radar absorber since RL <-10 dB is satisfied in the full X-band. Also, high EM absorbing performances in millimeter range, RL <-20 dB at 24 GHz (3 mm), and RL <-20 dB at 26.5 GHz (0.9 mm), could be achieved in the FMR-controlled La-Co-Ti substituted M-type hexaferrite-epoxy composite.
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