Polyol Process for Fe-based Hard (FCT-FePt) and Soft (FeCo) Nanoparticles

Abstract

Fe-Pt nanoparticles: equiatomic FePt nanoparticles with the ordered L10 structure is attractive as high-density magnetic recording media. In our recent work, chemically synthesized fcc-FePt nanoparticles with narrow size distribution and their self-assembled array with close-packed microstructure has been achieved successfully. However, the particles coalesced during the subsequent annealing step which is necessary to obtain L10 FePt nanoparticles. Later, the authors successfully demonstrated the direct synthesis of L10 FePt nanoparticles at low temperatures of 553 K using modified polyol method without subsequent annealing, whose diameter is 5-10 nm and intrinsic magnetocrystalline anisotropy field (Hk) of 31 kOe (B. Jeyadevan et al., 2003).