Control of electromagnetic wave absorption properties in La-Co-Ti substituted M-type hexaferrite-epoxy composites

被引：27
作者：
Lim, Eun-Soo [1 ]
Kim, Hyungsuk K. D. [2 ]
Kang, Young-Min [1 ]
机构：
[1] Korea Natl Univ Transportat, Dept Mat Sci & Engn, Chungju 27469, South Korea
[2] Hyundai Motor Co, Mat Dev Ctr, Powder Mat Dev Team, Hwaseong 18280, South Korea
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2021年 / 517卷 / 517期
基金：
新加坡国家研究基金会;
关键词：
Hexaferrite; Permittivity; Permeability; Ferromagnetic resonance; Reflection loss; EM absorption;
D O I：
10.1016/j.jmmm.2020.167397
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：7
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