Magnetic circular dichroism at transition metal L_2,3 edges in D0₃-type (Fe_1-xV_x)₃Al alloys

Magnetic circular dichroism (MCD) spectra have been measured at the Fe and V L_2,3 edges of D0₃-type (Fe_1-xV_x)₃Al in order to investigate their local magnetic moments and electronic structures. Large MCD is observed at the Fe L_2,3 edges, while the V L_2,3 MCD shows relatively small intensity with complicated features. Signs of these MCD spectra indicate an antiferromagnetic coupling between the magnetic moments on Fe and V. According to the analysis based on the magneto-optical sum rules, the magnetic moment decreases with x, but remains fairly large for Fe₂VAl, which might arise from its marginally magnetic nature.