Bulk multilayers Cold rolling FePt magnets Micro-system magnets Nanostructured magnetic materials
Issue Date:
2003
Publisher:
Journal of Magnetism and Magnetic Materials
Citation:
Volume 257, Issue 3-Feb
Abstract:
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.
