Permeability measurements from free-space technique and theoretical simulation in millimeter-wave frequency range

Real part of permeability of Yttrium Gadolinium Iron Oxide (Gd-YIG) has been observed in the frequency range from 30 to 120 GHz by using a free-space quasi-optical millimeter-wave spectrometer. The simulation results from both Schloemann's and Soohoo's equation have also been studied. The comparison between the simulation and experimental result, and the standard deviation have been performed and calculated through the whole frequency range.