INVESTIGADORES
SIRKIN Hugo Ricardo Mario
artículos
Título:
Influence of Misch-Metal on the Magnetic Properties of B-rich Nd-Fe-B Nanocrystalline Ribbons
Autor/es:
F. D. SACCONE AND H. SIRKIN
Revista:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Editorial:
Elsevier Science
Referencias:
Lugar: Amsterdam; Año: 2005 vol. 294 p. 127 - 130
ISSN:
0304-8853
Resumen:
In this work, a study of the structural and magnetic properties of B-rich rare earth (RE)?Fe?B nanocomposite alloys,
was carried out. The samples were produced by annealing amorphous ribbons having compositions
(Nd1xMMx)4.5Fe77B18.5 (Mischmetal (MM), x ¼ 0:0 and 0.25). For x ¼ 0:0 and 0.25, the crystalline t-(Fe, RE)3B
and a-(Fe, RE) phases precipitated at temperatures above 550 1C, with typical grain sizes on the nanometric scale. Low
MM addition (x ¼ 0:25) degraded the coercivity of annealed ribbons, which was found to diminish from 1.330 to below
0.035 kOe, although similar hard and soft phases with optimised volume fractions are present. These two extreme values
for a few MM at% content could be attributed to changes in the magneto-crystalline anisotropy, which modify the
typical nanomagnetic lengths.
1xMMx)4.5Fe77B18.5 (Mischmetal (MM), x ¼ 0:0 and 0.25). For x ¼ 0:0 and 0.25, the crystalline t-(Fe, RE)3B
and a-(Fe, RE) phases precipitated at temperatures above 550 1C, with typical grain sizes on the nanometric scale. Low
MM addition (x ¼ 0:25) degraded the coercivity of annealed ribbons, which was found to diminish from 1.330 to below
0.035 kOe, although similar hard and soft phases with optimised volume fractions are present. These two extreme values
for a few MM at% content could be attributed to changes in the magneto-crystalline anisotropy, which modify the
typical nanomagnetic lengths.
a-(Fe, RE) phases precipitated at temperatures above 550 1C, with typical grain sizes on the nanometric scale. Low
MM addition (x ¼ 0:25) degraded the coercivity of annealed ribbons, which was found to diminish from 1.330 to below
0.035 kOe, although similar hard and soft phases with optimised volume fractions are present. These two extreme values
for a few MM at% content could be attributed to changes in the magneto-crystalline anisotropy, which modify the
typical nanomagnetic lengths.
x ¼ 0:25) degraded the coercivity of annealed ribbons, which was found to diminish from 1.330 to below
0.035 kOe, although similar hard and soft phases with optimised volume fractions are present. These two extreme values
for a few MM at% content could be attributed to changes in the magneto-crystalline anisotropy, which modify the
typical nanomagnetic lengths.
