1. Microwave attenuation properties of W-type barium ferrite BaZn2-xCoxFe16O27 composites.
- Author
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Li, Z.W., Linfeng Chen, Yuping Wu, and Ong, C.K.
- Subjects
MICROWAVE attenuation ,BARIUM compounds ,PERMEABILITY ,ANISOTROPY ,PROPERTIES of matter ,ELECTROMAGNETISM - Abstract
The complex permeability and permittivity, the relationship between dynamic and static properties, and attenuation properties have been studied for BaZn
2-x Cox Fe16 O27 composites with x=0.7–2.0. The results show that the resonance frequency fR is controlled by the out-of-plane anisotropy field Hθ , and the static permeability μ0 ′ is related to the in-plane anisotropy field H[lowercase_phi_synonym] . For appropriate resonance frequency and high complex permeability, the percentage bandwidths of ΔW=Δf/f0 >90% for attenuation of 10 dB or more can be achieved by composites with x=0.7 and 1.0. Therefore, W-type barium ferrites with easy c-plane anisotropy are good candidates for electromagnetic materials with low reflectivity over broad frequency range at microwaves. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]- Published
- 2004
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