Ultra wideband permeability in micron and nanometer scale two and three phase ferrite, fe and magnetite composites

Summary form only given, as follows. Magnetic susceptibility data, applicable to filters, isolators, EMI materials and antenna substrates, are presented for dielectric composites containing a wide range of volume fractions of different magnetic particulates, as well as fully dense ferrites. Properties were measured from 0.001 to 18 GHz and were fit to Lorentzian forms. The data fits form the basis for comparison of magnetic Maxwell Garnett and Bruggeman effective media theory predictions of susceptibility and volumetric scaling of resonant and relaxation frequencies.