Abstract
A variety of differently shaped FePt nanocrystals, including flower-like FePt-Fe3O4 nanodendrites, flower-like FePt nanodentrites, mixtures of worm-like nanowires and nanoparticles and spherical nanoparticles were synthesized by properly choosing shielding atmosphere including pure Ar, mixture of different ratio of Ar and H2, and pure H2. The growth of FePt nanocrystals in the presence of H2 is mainly owing to H2 absorbed on the surface of seeds, which hindered the seeds of the particles' aggregation and promoted the growth on the surface of the seeds. The as-synthesized nanocrystals were found to be superparamagnetic at room temperature and their ferromagnetic-superparamagnetic transition temperature was 100 K, 55 K, 25 K and 20 K respectively, which was correlated to their composition and morphology.
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