ABSTRACT
The GMI effect is basically the surface effect, and our previous investigation using the magneto-optical Kerr effect showed that the transformation of the surface magnetic structure has a great influence on the value of the GMI ratio [1]. A special role in the correlation between the results of the magnetoimpedance and magneto-optical experiments plays the surface helical anisotropy [2]. Taking into account that the surface anisotropy is very sensitive to different types of the mechanical stresses, we have chosen a series of glass-covered microwires with different thickness of glass covering. It is known that the glass covering produces strong internal stress in the wire that leads to a transformation of the magnetic structure of the surface.
