Annealing and geometric effects in the magneto-impedance of amorphous Co70.4Fe4.6Si15B10 alloys

Giant magneto-impedance effects in different measuring geometries (longitudinal and transverse) of amorphous Co70.4Fe4.6Si15B10 ribbons under different field annealing have been studied at various frequencies (0.1 Hz-2 MHz). For suitably annealed samples, rich peak features have been observed in longitudinal MI measurements. For transverse MI measurements, a large effect magnitude has also been found. These results are discussed in terms of the effects-of the magnetic annealing and measurement geometries on the effective permeability. (C) 1996 American Institute of Physics.