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High-frequency Permeability of Fe-Co and Co Granular Composite Materials
Teruhiro Kasagi,Takanori Tsutaoka,Aiko Tsurunaga,Kenichi Hatakeyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The relative complex permeability and permittivity spectra of Fe50Co50 (Permendur) and Cogranular composite materials containing heat-treated particles have been studied in the microwavefrequency range up to 20 GHz. Fe50Co50 granular composite materials have a larger relative permeabilityvalue than Co composites at the same particle content owing to the differences in themagnetizations and the magnetic anisotropies between Fe50Co50 and Co particles. Negative permeabilitydispersions were observed in both composites at frequencies above 6 GHz. The effect of a dcmagnetic field on the permeability spectra revealed that the permeability dispersion of Co compositescould mainly be attributed to the gyromagnetic spin resonance in the microwave range. Fromthe relative permittivity spectrum, these two metal granular composites have a dielectric propertyeven at high particle contents.