The structural and magnetic properties of Fe_73.5-xCr_xNb₃Cu₁Si_13.5B₉ alloy ribbons have been studied after appropriate processing achieving nanocrystalline structure and showing ultrasoft magnetic behavior, especially giant magnetoimpedance effect, GMI[1]. Characterization has been performed by X-ray diffraction (XRD), vibrating sample magnotometry (VSM), GMI measurements and atomic force microscopy/magnetic force microscopy (AFM/MFM). Particu-lar attention has been paid to observation of domain structure by MFM imaging. A periodic stripe domain structure is generally observed. A comparison between structural and magnetic properties (i.e. coercivity, remanence) and magnetic domain structures of above compounds is presented, and such properties are analyzed in connection with the GMI effect .