Irreversible Susceptibility of Initial Magnetization Curve

A method for estimation of reversible and irreversible susceptibilities of initial magnetization curves has been developed. It deals only with the energy necessary for magnetizing the sample and the nature of the magnetization processes is not important. Thus the method could be applied for a wide variety of real materials. A set of minor hysteresis loops of a virgin sample, plotted with progressively increasing maximum magnetic field, has been used. The obtained results for both reversible and irreversible magnetizations, showed excellent coincidence with those, calculated by the remanence curve method for a Stoner-Wohlfarth model system.