Square-loop ferrites with sinusoidal magnetization

The switching speed of square-loop ferrite cores is limited mainly by the restricted speed of domain wall movement, and not by eddy currents as in a metallic core. Their use in magnetic amplifiers and modulators allows the excitation frequency to be raised, giving greater bandwidth. This paper uses a simple theory of flux reversal in square-loop ferrites to predict switching speed with sinusoidal magnetizing force, and gives the results of experiments carried out to test this theory.