Die Temperaturabhängigkeit des magnetischen Barkhausen-Effekts IV

The size distribution of Barkhausen discontinuities (magnetic moment > 6.5 · 10^?7 cgs) of very pure nickel was measured between ?195 and 360 °C on the hysteresis loop. The mean value of internal stresses was changed in a well defined manner by stretching the specimens. For different stress values the variation with temperature of the following properties is given in diagrams: The specific number and the “mean volume”² of discontinuities, the maximal value of Barkhausen susceptibility, the mean deviation of the volume of discontinuities along the hysteresis curve, and some characteristic field strengths defined by reversible and irreversible processes. Conclusions are drawn concerning the coupling of individual wall movements composing a Barkhausen jump.