Microwave Characterization of Partially Magnetized Ferrites

In order to assist the microwave engineer in predicting the performance of partially magnetized devices, we have characterized the microwave permeability of partially magnetized materials. The real part of the tensor permeability elements, μ, κ, and μ_z, depends primarily on the parameters γ4πM/ω and γ4πM_s / ω. Empirical formulas have been developed which show the dependence. At frequencies sufficiently below ω = π4πM_s, the loss can be characterized by the value of μ´´ at 4πM = 0.μ, κ, and μ_z depend weakly on composition, whereas μ´´ (4πM = 0) does depend upon the chemical composition.