Circumferential magnetization processes in CoFeBSi wires

The total impedance, Z, of low magnetostriction wires (Co0.94Fe0.06)(72.5)B15Si12.5 was measured at 100 kHz under ac currents of various amplitudes, i, for as-cast and current annealed samples. We show that curves Z vs i can represent circumferential permeability curves and that the features observed on these curves as a consequence of annealing can be interpreted due to the induced magnetic anisotropy by the effect of the current annealing. (C) 1996 American Institute of Physics.