Unsymmetrical Hysteresis Loops in a Nickel-Iron Alloy

Abstract

IN the course of investigations of grain-oriented nickel–iron alloys, a very pronounced asymmetry has been observed in the dynamic hysteresis loop of one particular sample. The effect is demonstrated by momentarily applying a large D.C. magnetizing force to the core and then examining the subsequent hysteresis loops produced by smaller A.C. excitation. Depending on the magnitude of the exciting current the loops appear as in Fig. 1, the magnetizing pulse having previously been applied in the positive direction. The deeper loops result from larger exciting currents.