Tunable negative permittivity and permeability in FeNiMo/Al₂O₃ composites prepared by hot-pressing sintering

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• 作者：Min Chen^a ; ^{chenmin6245@163.com" class="auth_mail" title="E-mail the corresponding author} ; Meng Gao^a ; ^{467840662@qq.com" class="auth_mail" title="E-mail the corresponding author} ; Feng Dang^a ; ^{dangfeng@sdu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ning Wang^b ; ^{wangn02@foxmail.com" class="auth_mail" title="E-mail the corresponding author} ; Baoqin Zhang^c ; ^{zhangbq1982@163.com" class="auth_mail" title="E-mail the corresponding author} ; Shibing Pan^a ; ^c ; ^{psb7@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A. Hot pressing ; C. Dielectric properties ; C. Magnetic properties ; FeNiMo/Al2O3 composite
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：6444-6449
• 全文大小：1717 K

文摘

FeNiMo/Al₂O₃ composites with different FeNiMo content were prepared by hot-pressing sintering. Interestingly, simultaneous negative permittivity and permeability were realized in FeNiMo/Al₂O₃ composites with 30% FeNiMo content in the frequency range of 860 MHz to 1 GHz and in the frequency range of 890 MHz to 1 GHz for composites with 40% FeNiMo content. Experimental results and theoretical simulations indicate that the negative permeability is caused by the domain wall resonance and gyromagnetic spin resonance, while the negative permittivity is attributed to the plasma oscillation of conduction electrons and LC resonance. The negative permittivity of the FeNiMo/Al₂O₃ composite induced by the plasma oscillation of conduction electrons was analyzed using the Drude model. The fitting results indicated that the plasma frequency of the composites was 8.99 GHz.