Magnetic Hysteresis in Simple Materials. II. Experiment

Abstract

Theory is compared with experiment. The applicability of the theory to a sample which is magnetically sufficiently simple is demonstrated by comparing certain qualitative predictions of the theory with experiment. In particular it is shown that the ascending branches of all minor loops coincide if they are all started at the same point. The ascending branch of a minor loop coincides with the ascending virgin curve if they both start at the same point and if the gain of the flux and mmf channels of the minor loop are reduced by a factor of 2. The virgin curve is the locus of apexes of centered minor loops. The relation between height and width of minor loops is shown to agree quantitatively with theory. The shape of a branch of a single minor loop is also found to agree. The first three terms of the Fourier analysis of mmf for sinusoidal flux variation are found to be in good agreement with theory except for the third harmonic which at least has the correct order‐of‐magnitude. Theory and experiment are shown to be in good agreement in the Rayleigh region. However, the applicability of the present theory is not confined to the Rayleigh region, but applies right up to saturation for a specimen meeting the criteria of simplicity. The predicted relation between the Rayleigh constants and the coercive force is shown to hold. Finally the distribution function is calculated from a minor loop and shown to be an exponential with reasonable accuracy.