Precision transmittance measurements on ferrites in millimeter waves

This paper presents transmittance spectra and complex magnetic permeability and dielectric permittivity parameters of pure and mixed powdered barium ferrites, nickel zinc manganese ferrites and nickel cobalt copper ferrites in a broad-band millimeter wave frequency range. A free space, millimeter wave magneto-optical approach has been successfully employed for precise characterization of ferrite materials. Frequency dependences of the magnetic permeability of ferrites have been calculated using Schlomann's equation for partially magnetized ferrites.