EFFECTS OF CREEP-INDUCED ANISOTROPY ON CIRCUMFERENTIAL MAGNETIZATION IN NON-MAGNETOSTRICTIVE WIRES

The effects of applied tensile stress, sigma, on the magnetic properti es of stress-annealed amorphous wires (Co0.94Fe0.06)(72.5)B15Si12.5 we re investigated. Stress-current annealing was performed at various ten sile stresses, sigma, in the range 0-800 MPa. Circular magnetization c urves were obtained from the complex impedance response of the wire, s ubmitted to currents between 0.01 and 30 mA (rms) at a frequency of 1 kHz. A transverse anisotropy is developed by these thermal treatments, which results in a continuous increase in the axially measured anisot ropy field with sigma. The circumferential magnetization curves, howev er: exhibit two different behaviors of the pinning field. separated by a critical tensile stress (450 MPa). These results are interpreted in terms of the changes produced on the domain structure by stress annea ling.