Dynamic coercive field of bistable amorphous FeSiB wires

The dynamic coercive field and area of the hysteresis loop A have been measured for bistable amorphous FeSiB wire as functions of frequency f and amplitude of an applied magnetic field. The results are presented in the form , . The values of the exponents m , p , x and z are given for an as-quenched wire with applied tension and without tension, and for an annealed wire with applied tension. The range of frequency f is from 0 to 700 Hz, and the range of amplitude is from 0 to 140 A . The exponents vary from 0.22 to 0.86. Differences are found for the first time between m and p , and between x and z . For higher frequencies ( f >150 -350 Hz) the bistable remagnetization process is not complete. Observed values of the exponents can be partially understood in terms of an equation of motion of reversible displacement of domain walls for the case of a small restoring force.