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Magnetism, structure and the effects of thermal aging on (Fe1-xMnx)73.5Si13.5B9 Nb3Cu1 alloys

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12 Author(s)
Tamoria, M.R. ; Naval Res. Lab., Washington, DC, USA ; Carpenter, E.E. ; Miller, M.M. ; Claassen, J.H.
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Amorphous alloys of (Fe1-xMnx)73.5Si13.5B9 Nb3Cu1, where x=0, 0.05, 0.10, 0.15, were prepared by vacuum melt-spinning. Anneals performed at or above the crystallization temperature led to the formation of a nanostructure where the primary phase is a body centered cubic or DO3 FeSi phase embedded within an intergranular amorphous phase. The saturation induction of the x=0.05 alloy is 1.19 T, slightly lower than the parent alloy. Prolonged thermal aging led to an enhancement in the soft magnetic properties. This change occurs at soak times near 6000 s and corresponds to a decrease in the anisotropy and coercivity, and an increase in the remanent magnetization. EXAFS studies suggest that the Mn partitions during crystallization and thermal aging to the grain boundary regions may play an important role in enhancing the exchange coupling of the aged samples by increasing the Curie temperature of the amorphous intergranular phase

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )