Magnetic properties of surface layers of Fe71.5Si15.5-xCu1Nb3B9Alx (x=0,1,2,3 at%) alloys with substitutions by aluminium

In this paper we describe the influence of the composition and the annealin g treatment on the domain structure of Fe-Si-Cu-Nb-B-Al alloys with differe nt Al/Si content. Our observations were compared with the bulk and surface layer coercivity. We have found that aluminium influences magnetic properti es and the domain structure of these alloys. Since the crystallization temp erature of these alloys decreases with increasing Al content, our samples d id not show any improvement of soft magnetic properties as compared with Fi nemet. (C) 2000 Elsevier Science B.V. All rights reserved.