G. Bordin et al., Temperature dependence of magnetic properties of a Co-based alloy in amorphous and nanostructured phase, J MAGN MAGN, 195(3), 1999, pp. 583-587
The magnetic properties of a Go-based amorphous alloy (Metglas 2714A) are c
ompared with those of the corresponding nanostructured alloy in the tempera
ture range 30 K to the Curie temperature. A minimum appears in the permeabi
lity versus temperature curve well below the Hopkinson peak for the amorpho
us alloy. This minimum is ascribed to a form of induced anisotropy due to s
tructural instabilities. In contrast, the alloy containing the nanostructur
ed phase, having excellent soft magnetic properties, shows a maximum below
the Hopkinson peak which is interpreted as a combination of the variations
of the anisotropy and the saturation magnetization with temperature. The an
isotropy field distribution is also evaluated in the low-temperature range
for both the amorphous and nanostructured phase of the alloy. The most prob
able anisotropy field for the nanostructured sample is ten times lower than
that of the amorphous sample. (C) 1999 Elsevier Science B.V. All rights re
served.