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Measurements of complex dielectric permittivity and magnetic permeability of Ba- and Sr- ferrites in the range 1-10 cm-1 (30-300 GHz)

The dispersive Fourier transform spectroscopic technique was improved to extend the frequency range at the long millimeter wavelength range for study of real and imaginary parts of complex dielectric permittivity and complex magnetic permeability magnetic materials. The use of a 110, 000 Gauss superconducting magnet alligns all magnetic dipoles with the precessional frequency centering around 330 Gllz. Complex dielectric permittivity and magnetic permeability were then evaluated for Ba- and Sr- ferrites over the frequency region 30 - 300 GHz.