Abstract
Frequency dependencies of permittivity and permeability of composites filled with Permalloy powder with various concentrations and shapes of particles have been measured and discussed. The powder particles of various shapes were obtained by mechanical milling of industrial Permalloy powder in organic media. Paraffin wax was used as a matrix for producing the composites. A shape data of the particles were obtained with an electron microscope. The permittivity and permeability were measured in the frequency range of 0.1–20 GHz. It is shown that the shape of the particles changes from sphere to plate with increase of milling time. The change leads to a shift of the ferromagnetic resonance (FMR) frequency and the magnetic loss peak. It is shown that larger damping of the FMR is typical for larger particles. With increase of the concentration of Permalloy particles in composite, the magnetic loss peak shifts to lower frequencies. The measured frequency dependencies of the material parameters are discussed in terms of the theory of composites.
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