Comparative Study of Magnetic Properties Between Ribbon and Bulk Fe-Si-B-P-C Amorphous Alloys

A comparative study of the magnetic properties between Fe_(76)P_5(B_(0.5)Si_(0.3)C_(0.2))_(19) amorphous ribbon and its corresponding bulk amorphous alloy were performed. The magnetic domain structures of the samples were observed by magnetic force microscopy (MFM). The result indicated that the magnetic domain structures between the a morphous ribbon and bulk amorphous alloy were quite different. The band domains with a width of about 5 mum were observed in the free surface of the amorphous ribbon while the domains in the longitude section of the bulk amorphous alloys show a branched morphology with a narrow width and high density. The difference in the domain structures can account for the differences in the magnetic properties such as coercive force (H_c) and Curie temperature (T_c) between the amorphous ribbon and bulk amorphous alloy.