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Title:
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An original route for the preparation of hard FePt |
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Author:
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N.H., Hai; Dempsey, N.M.; Veron, M.; Verdier, M; Givord, D.
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Abstract:
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The preparation of FePt hard magnetic foils by an original procedure is described in this paper.
The process associates cyclic co-deformation of Fe and Pt foils down to the nanometer scale (total thickness
of multilayer ?? 100 ?m) followed by heat treatment in the temperature range 450-550?C. The formation of
the high-anisotropy L10 FePt phase results from controlled diffusion and an ordering phase transformation.
Coercivities as high as 0.9 T were measured in a VSM at room temperature following annealing at 450?C
for 48 h. The coercivity of this sample was decreased by half when measured at 600 K while its energy
product decreased from 100 kJ/m3 at 300 K to 25 kJ/m3 at 600 K. ?? 2002 Elsevier Science B.V. All rights
reserved. |
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URI:
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http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7105
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Date:
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2003 |