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The low power loss and high power threshold properties have been measured on a number of candidate ferrite phase-shifting materials. The low power loss is characterized by μ0'', the imaginary part of the diagonal component of the permeability tensor for the completely demagnetized state. μsub 0/'' was measured from 3.0 to 16.8 GHz. The high power properties are characterized by the parallel pump threshold at a bias field correspontig to Hi ≡ 0 and to 4πM ≡ 4πMs. The threshold was measured between 3.0 and 16.8 GHz. For the purposes of computer calculation μ0'' and hcrit were fit to an equation of the form A (γ4πMs / ω)N. Translating μ0'' and hcrit to ΔHeff and ΔHk gives the YIG plus Al as the lowest loss and lowest threshold materials followed by the Gd garnets and MgMn spinels. The Ni spinels are very Iossy.