A model for asymmetric giant magnetoimpedance in field-annealed amorphous ribbons

Buznikov, N.A.; CheolGi Kim; Chong-Oh Kim; Seok-Soo Yoon
October 2004
Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3507
Academic Journal
A phenomenological model for the asymmetric giant magnetoimpedance (GMI) in field-annealed amorphous ribbons is developed. The effect of a surface crystalline layer on the GMI response is described in terms of an effective bias field appearing due to a coupling between the crystalline layer and amorphous phase. It is shown that the presence of the bias field changes drastically the GMI profile. At low frequencies, the domain-walls motion leads to a steplike change in the GMI response. At high frequencies, the domain-walls motion is damped, and the GMI profile exhibits asymmetric two-peak behavior. The calculated dependences are shown to be in a qualitative agreement with results of experimental studies of the asymmetric GMI in field-annealed Co-based amorphous ribbons.


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