Enhanced remanence in flash-annealed Nd(4)Fe(78)B (18)

Nanocrystalline Nd(4)Fe(78)B(18) was produced by affixing current leads directly to amorphous ribbons for flash-annealing. Ribbons were annealed in the range T(a)=650-1000 deg C, for times 10-600 s. Flash-annealed ribbons show higher remanence ratios (M(r)/M(s)=0.83) than those submitted to conventi...

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Published inIEEE transactions on magnetics Vol. 31; no. 6; pp. 3614 - 3616
Main Authors Altoe, M V P, Lancarotte, M S, Rechenberg, H R, Missell, F P, Gonzalez, J M
Format Journal Article
LanguageEnglish
Published 01.11.1995
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Summary:Nanocrystalline Nd(4)Fe(78)B(18) was produced by affixing current leads directly to amorphous ribbons for flash-annealing. Ribbons were annealed in the range T(a)=650-1000 deg C, for times 10-600 s. Flash-annealed ribbons show higher remanence ratios (M(r)/M(s)=0.83) than those submitted to conventional furnace (680 deg C/10 min) annealing (M (r)/M(s)=0.74). In flash-annealed ribbons, Mossbauer spectroscopy and X-ray diffraction indicated the presence of the Nd(2)Fe(23)B(3) phase, in addition to Fe(3)B, Nd(2)Fe(14)B, and alpha-Fe. Flash-annealing for short times at high temperatures may give H(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
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ISSN:0018-9464
DOI:10.1109/20.489586