Smart measurement setup for spin wave linewidth /spl Delta/Hk

Summary form only given. Power capability of ferrite based high power applications like circulators and phase shifters is limited due to the onset of Suhl instabilities, which sensitively depends on dissipation. Therefore spin wave linewidth measurements are very important. More-over the microstructure of polycrystalline ferrite material leads to a frequency dependent spin wave linewidth. High power microwave sources and the related waveguide equipment are expensive, so a low power, low cost and wide frequency measurement setup would be helpful. Such a setup is presented.