ABSTRACT

Fe-Rich Amorphous WireAmorphous wires of nominal composition Fe77.5B15Si7.5 and diameter 0.05 mm, obtained by in-rotating-water-quenching technique + cold-drawing process, were provided by Goodfellow Company, UK. The wires were submitted to thermal treatment by using a current annealing technique (210 mA for 45 min). Conventional hysteresis loops were measured by fluxmetric method in an AC axial magnetic field of 50 Hz. A pair of Helmholtz coils has been employed to produce an axial magnetic field. DC axial and DC circular bias magnetic fields have been applied during the magneto-optical and fluxmetric experiments, respectively.Figure 2.1 presents the bulk hysteresis loops measured by the fluxmetric method with DC electric current as a parameter. The magnetization reversal consists of two successive jumps of magnetization. The shape of the hysteresis loop changes with the DC electric current (i.e., DC circular magnetic field). In particular, the decrease of the switching field for the second jump takes place.