Millimeter-wave magnetooptics: New method for characterization of ferritesin the millimeter-wave range

This paper presents a new free-space millimeter-wave method based on the tr ansverse magnetooptical effect, which provides the complete and accurate ch aracterization of the ferrites for the first time in the millimeter-wave ra nge. The described data analysis and processing methods lead to the separat ion of dielectric and magnetic effects and to the simultaneous determinatio n of both millimeter-wave permittivity and permeability. It is demonstrated that this new method can be used for the characterization df the soft ferr ites as well as the hard anisotropic ferrites, The magnetooptical measureme nts were realized using a millimeter-wave spectrometer combined with the el ectromagnet providing the transverse magnetic field up to 1 T. The backward -wave oscillators were used as a source of tunable coherent millimeter-wave radiation, It was shown that the free-space method applying the polarized Gaussian beams generates precise transmission data and enables the accurate determination of the optical constants of ferrites in the entire millimete r-wave range.