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Bulk FePt-based nanocomposite magnets with enhanced exchange coupling
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) The dependence of density of the bulk samples on compaction temperature .

Image of FIG. 2.
FIG. 2.

SEM images of the bulk samples compacted at 20, 400, and .

Image of FIG. 3.
FIG. 3.

(Color online) XRD patterns of the bulk samples compacted at (a) 20, (b) 400, and (c) . The Rietveld refinement data are also included in (c) for the -compacted sample. The symbol (엯) and full line represent the observed and calculated x-ray diffraction profiles, respectively. The vertical bars represent the Bragg reflection positions of the observed phases (from top to bottom: FePt and ). The difference curve is plotted in the bottom.

Image of FIG. 4.
FIG. 4.

(Color online) The dependence of on for the bulks. For comparison, the dependence of on annealing temperature of the starting powder is also included for 10 min annealing.

Image of FIG. 5.
FIG. 5.

(Color online) The dependence of and on .

Image of FIG. 6.
FIG. 6.

(Color online) The dependence of grain size and microstrain on for as-compacted samples. The grain size of the annealed samples and the compacted nanoparticles are also given.

Image of FIG. 7.
FIG. 7.

TEM micrographs of bulk samples compacted at different temperatures. (a) 20, (b) 400, (c) , and (d) SAED patterns at different temperatures.

Image of FIG. 8.
FIG. 8.

(Color online) (a) plots of the samples compacted at 400 and from the fcc nanoparticles. (b) plots of the separated particles and samples compacted (at 2.5 GPa, ) from the nanoparticles as well as the post-annealed bulk samples. The insets are the corresponding demagnetization curves.

Image of FIG. 9.
FIG. 9.

(Color online) The dependence of , , and on the annealing temperature for 20, 400, and -compacted samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bulk FePt-based nanocomposite magnets with enhanced exchange coupling