Reversal of a Loaded Ferromagnetic Core

Summary--This paper discusses the performance of a toroidal square-loop ferromagnetic core as a circuit element. The analysis takes account of two different physical processes in the core: a reversible one which contributes to the fast initial rise of the output signal, and an irreversible one, tentatively described as domain rotation, which is mainly responsible for switching the core. A differential equation is set up which governs the entire physical system, including the external circuit, and leads to a calculation of the output signal and its dependence on the secondary loading. Core parameters determined experimentally for an open-circuited core are used to predict the output signal when the core is loaded, and close agreement is found with measured values.