Modeling of domain structure and anisotropy in glass-covered amorphous wires

Giant magnetoimpedance (GMI) at 10 MHz and longitudinal magnetization curve s are used to investigate the anisotropy of Co68.15Fe4.35Si12.5B15 wires, g lass-covered and after glass removal. The high resolution GMI response to t he field shows hysteresis and large Barkhausen jumps, in good agreement wit h those observed in the magnetization curves. These are modeled through sup erposition of the response of the inner core and outer shell of the wires. The GMI response is calculated using the differential susceptibility deduce d from the model, thus relating the domain structure to the observed magnet oimpedance. (C) 1998 American Institute of Physics.