Enhanced remanence in flash-annealed Nd{sub 4}Fe{sub 78}B{sub 18}

Journal Article · Wed Nov 01 04:00:00 EST 1995 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.489586· OSTI ID:186924

Altoe, M V.P.; Lancarotte, M S; Rechenberg, H R; Missell, F P ^[1]; Gonzalez, J M ^[2]

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1. Univ. de Sao Paulo (Brazil). Instituto de Fisica
2. CSIC, Madrid (Spain). Instituto de Ciencias de Materiales

Nanocrystalline Nd{sub 4}Fe{sub 78}B{sub 18} was produced by affixing current leads directly to amorphous ribbons for flash-annealing. Ribbons were annealed in the range T{sub a} = 650--1,000 C, for times 10--600 s. Flash-annealed ribbons show higher remanence ratios (M{sub r}/M{sub s} {approx_equal} 0.83) than those submitted to conventional furnace (680 C/10 min) annealing (M{sub r}/M{sub s} {approx_equal} 0.74). In flash-annealed ribbons, Moessbauer spectroscopy and x-ray diffraction indicated the presence of the Nd{sub 2}Fe{sub 23}B{sub 3} phase, in addition to Fe{sub 3}B, Nd{sub 2}Fe{sub 14}B, and {alpha}-Fe. Flash-annealing for short times at high temperatures may give H{sub c} values up to 20% higher than furnace annealing. The isothermal remanent magnetization and the dc demagnetization remanence were found to be in reasonable agreement with the Wohlfarth relation.

• OSTI ID: 186924
• Report Number(s): CONF-950404--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 6Pt2 Vol. 31; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BORON ALLOYS
CRITICAL FIELD
CRYSTALLIZATION
IRON BASE ALLOYS
MAGNETIC PROPERTIES
METALLIC GLASSES
MICROSTRUCTURE
NEODYMIUM ALLOYS