Abstracts The magnetic (static, high-frequency) and microwave absorbing properties of Zn- or Ni-substituted Co2W hexaferrites have been investigated for application in commercial drones and wireless LANs operated at the frequency of 5.8 GHz. Powders with a composition of (BaCo2-xMexFe16O27 (Me=Zn, Ni)) were prepared by calcination at 1250 °C, where the substitution ratio x was varied from 0.0 to 1.5. With the calcined powders, composite specimens were prepared using silicone rubber as a matrix material. Vibrating sample magnetometry measurements indicate that the composite specimens of Zn-substituted Co2W hexaferrite powders exhibited increased saturation magnetization and decreased coercive force. As a result, ferromagnetic resonance occurred in the frequency range below 6 GHz, which is attributed to the decreased crystal anisotropy field on the basal plane. However, with Ni substitution, the complex permeability spectrum showed an increased resonance frequency (12.9 GHz), which is attributed to the increased crystal anisotropy field by changing the easy-axis of magnetization from the basal plane to the c-axis. The specimens with Zn substitution showed superior microwave absorbing properties at C-band frequencies. For the specimen with Zn substitution with x = 1.0, a reflection loss of −35 dB was obtained at 5.8 GHz with a matching thickness of 4 mm.

中文翻译：

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Zn 和 Ni 取代对 Co2W 六方铁氧体 (FG:PO2) 磁性和微波吸收性能的影响

摘要 已经研究了 Zn 或 Ni 取代的 Co2W 六铁氧体的磁性（静态、高频）和微波吸收特性，用于在 5.8 GHz 频率下运行的商用无人机和无线 LAN 中的应用。通过在 1250 °C 下煅烧制备具有 (BaCo2-xMexFe16O27 (Me=Zn, Ni)) 组成的粉末，其中取代比 x 从 0.0 到 1.5 变化。使用煅烧粉末，使用硅橡胶作为基体材料制备复合样品。振动样品磁力测量表明，Zn 取代的 Co2W 六铁氧体粉末的复合样品表现出增加的饱和磁化强度和降低的矫顽力。结果，在 6 GHz 以下的频率范围内发生了铁磁共振，这归因于基面上晶体各向异性场的降低。然而，随着 Ni 的取代，复杂的磁导率谱显示出增加的共振频率（12.9 GHz），这归因于通过将磁化易轴从基面改变到 c 轴来增加晶体各向异性场。Zn 取代的样品在 C 波段频率显示出优异的微波吸收性能。对于具有 x = 1.0 的 Zn 取代的样品，在 5.8 GHz 下获得了 -35 dB 的反射损耗，匹配厚度为 4 mm。Zn 取代的样品在 C 波段频率显示出优异的微波吸收性能。对于具有 x = 1.0 的 Zn 取代的样品，在 5.8 GHz 下获得了 -35 dB 的反射损耗，匹配厚度为 4 mm。Zn 取代的样品在 C 波段频率显示出优异的微波吸收性能。对于具有 x = 1.0 的 Zn 取代的样品，在 5.8 GHz 下获得 -35 dB 的反射损耗，匹配厚度为 4 mm。