The Study of magnetocrystalline Properties of Iron-Platinum (L10-FePt) Nanoparticles Through phase transition

majid Farahmandjou¹

IOI Code : XYCC-ABDZD
Publication : International Conference on Science and Engineering(icesconf.com)
Abstract :
    High magneto- crystalline anisotropy (Ku = 7×106 J/m3) of L10-FePt nanoparticles are an excellent candidate for ultrahigh-density magnetic recording. The 4 nm FePt nanocrystals are prepared by superhydride reduction of FeCl2•4H2O and Pt(acac)2 precursors in the phenyl ether by reducing of the 1,2-hexadecanediol and LiBEt3H superhydride. The crystal and magnetic structures are studied by XRD and VSM analysis. By TEM and EDS analyses the size distribution and molar concentration of Fe/Pt of the nanoparticles are determined. The results show that the particles are first superparamagnetic before heat treatment and then a phase transition accrue from disorder fcc to order fct structure after annealing. Finally, phase transition lead to increase magnetic anisotropy of hard FePt nanoparticles to7 kOe.

Keywords : magneto crystalline anisotropy l10 fept nanocrystals superparamagnetic phase transition