Magnetism, Structure and the Effects of Thermal Aging on (Fe1-xMnx)73.5Si13.5B9Nb3Cu1 Alloys

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Abstract:

Amorphous alloys of Fe1-xMnx 73.5 Si13.5B9 Nb3Cu1, where chi 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 chi 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.

Author(s):
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 Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC
Descriptive Note:
Journal article
Supplementary Note:
Published in IEEE Transactions on Magnetics, v37 n4 p2264-2267, July 2001.
Pagination:
0005

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_8_Building Partnerships
Communities of Interest:
Advanced Electronics
Descriptor(s):
*MAGNETIC PROPERTIES, *THERMAL PROPERTIES, AGING(MATERIALS), VACUUM, MELTS, AMORPHOUS MATERIALS, CRYSTALLIZATION, ALLOYS, REGIONS, SATURATION, SPINNING(INDUSTRIAL PROCESSES), ANISOTROPY, COERCIVE FORCE, CURIE TEMPERATURE, MAGNETIZATION, EXCHANGE, INDUCTION SYSTEMS, GRAIN BOUNDARIES, TEMPERATURE, NANOSTRUCTURES, COUPLING(INTERACTION)
Field(s)/Group(s):
Electricity and Magnetism, Thermodynamics
Report Date:
2001 Jul 01
Creation Date:
2010 Mar 31