Abstract
Nonlinear effects at high rf power levels were investigated in substituted polycrystalline lithium ferrite with respect to changes in the dc conductivity of the material. Selected samples of a lithium-titanium ferrite system were thermally annealed to produce material with dc resistivities in the range 1010 to 100 Ω-cm. The threshold field, spin-wave linewidth, and field-dependent characteristics of the subsidiary absorption curve were investigated by the perpendicular pump technique in a 5600-Mc cavity. The rf threshold field required for the onset of nonlinearity exhibited a definite dependence upon the resistivity, increasing by a factor of three as the resistivity was decreased to 390 Ω-cm. The initial permeability spectrum maintained its characteristic form and no significant change was observed in the intrinsic magnetic properties over the range of resistivity values. Data are presented showing the observed relationships between the magnetic and dielectric properties and the dc resistivity. The application of this technique to improved peak power performance in a C-band wye-junction circulator is discussed.
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