Abstract
Sub-micrometer cobalt flakes were successively fabricated by hydrazine reduction in aqueous solution, the flakes were coated with silica layers by the hydrolysis method. Their microwave and static magnetic properties were investigated. The silica coated cobalt flakes are characterized with high resonance frequency at 4 GHz, and the real part of permeability μ′ were greatly improved when frequency was lower than resonance frequency. The improvement is ascribed to the suppression of eddy current loss after silica coating. The spectra of complex permeability were fitted with the Landau–Lifshitz–Gilbert equation and the resonance mode is proved to be the natural resonance mode.
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