VERIFICATION OF THE MODEL FOR THE MAGNETIZATION OF CURRENT-CARRYING AMORPHOUS RIBBONS

Detailed investigation of the dM/dt versus H curves and the correspond ing M-H loops for as-received magnetostrictive Fe80B20 alloy and nonma gnetostrictive Co70.3Fe4.7Si15B10 alloy carrying direct currents J(d) less than or equal to 160 mA has been performed. For both alloys (repr esenting two major classes of amorphous ferromagnetic alloys) the mode l for the influence of the surface field H-p generated by J(d) correct ly describes the motion of domain walls (as evidenced from dM/dt versu s H curves) and the variations of the macroscopic parameters such as t he coercive field H-c and the position of the center of the M-H loop, C with H-p can be explained in terms of these motions. Moreover the nu merical values of the parameters which govern the magnetization proces ses at lower H are deduced from these variations. Therefore the model presents a tool for the study (and improvement) of amorphous ribbons. The deviations from the model predictions occurring in Co70.3Fe4.7Si15 B10 alloy at elevated H-p are explained in terms of the influence of H -p on the domain structure of this alloy.