Title :
Magnetism, structure and the effects of thermal aging on (Fe1-xMnx)73.5Si13.5B9 Nb3Cu1 alloys
Author :
Tamoria, Michelle R. ; Carpenter, E.E. ; Miller, M.M. ; Claassen, J.H. ; Das, B.N. ; Stroud, R.M. ; Kurihara, L.K. ; Everett, R.K. ; Willard, M.A. ; Hsiao, A.C. ; McHenry, M.E. ; Harris, V.G.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
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
Keywords :
Curie temperature; EXAFS; ageing; amorphous magnetic materials; annealing; boron alloys; coercive force; copper alloys; crystallisation; exchange interactions (electron); ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic permeability; magnetisation; manganese alloys; nanostructured materials; niobium alloys; remanence; silicon alloys; soft magnetic materials; (Fe1-xMnx)73.5Si13.5B 9Nb3Cu1 alloy; (FeMn)73.5Si13.5B9Nb3 Cu1; Curie temperature; EXAFS; Finemet; amorphous intergranular phase; annealing; coercivity; crystallization temperature; exchange coupling; grain boundary; magnetic anisotropy; magnetic permeability; nanostructure; remanent magnetization; saturation induction; soak time; soft magnetic properties; thermal aging; vacuum melt spinning; Aging; Amorphous magnetic materials; Amorphous materials; Crystallization; Magnetic anisotropy; Manganese alloys; Perpendicular magnetic anisotropy; Saturation magnetization; Soft magnetic materials; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
