THE INFLUENCE OF NANOCRYSTALIZATION OF THE FeSiB AMORPHOUS ALLOY BY
MEANS OF Nd: YAG PULSED LASER HEATING ON MAGNETIC PROPERTIES. A.
Sypien, J.Kusinski, T.Stobiecki, M.Czapkiewicz University of Mining
and Metallurgy, 30 Mickiewicza Ave., 30059 Krakow, Poland
The influence of laser heating on magnetic properties and
microstructure of amorphous FeSiB alloy ribbons was examined. The
material was nanocrystalized by means of Nd: YAG pulsed laser heating.
The measurements of magnetic properties were conducted by means of the
rezonans vibrating sample magnetometer (R-VSM). The following magnetic
properties were determined: coercivity field, saturation of
magnetization M[S], and slope of the hysteresis loop
(dM/dH)[H][Ž][Hc]. These measurements give information about influence
on changes of magnetization saturation M[S ]and differential magnetic
susceptibility.[ ] The microstructure and domains structure changes
after laser heating was realised by means of the transmission and
Lorentz electron microscopy. The use of laser beam of relatively low
energy, but with a subsequent overlapping of heated areas, resulted in
a much more homogeneous nanostructure in the heated areas of the
ribbon. Laser treatment produces refinement of magnetic domain
structure of materials. The refinement domain structure causes
decrease lossiness and the magnetic hysteresis loops of laser treated
and furnace annealed samples weakly decreases (from 83.9 to 72.7) with
increasing of laser treatment intensity.

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