Ferromagnetic resonance and dielectric and magnetic properties of pure and diluted ferrites in millimeter waves

Transmittance measurements on pure and diluted barium ferrites, nickel zinc manganese ferrites, and nickel cobalt copper ferrites in millimeter wave-frequency range from 30 to 120 GHz have been performed for the first time. A free space millimeter wave magneto-optical approach has been successfully employed for the dielectric and magnetic characterization of ferrite materials. Simultaneous determination of dielectric permittivity and magnetic permeability has been carried out from a single set of transmittance measurements. Frequency dependences of the magnetic permeability and dielectric permittivity on pure and diluted ferrites in millimeter waves have been obtained. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3059611]