Abstract
Self-assembly FePt nanoparticles with extremely high magnetic anisotropy were predicted as one of the best materials for high-density storage hard disk in future. Recently FePtM (M=Cu, Ag, Au, Co, Pd, Mn ) nanoparticles were synthesized to investigate the effects of the third element addition. A series of FexRuyPt(1-x-y) nanoparticles was chemically synthesized in order to investigate the effect on magnetic transition temperature in the alloy system. We expect that by adding ruthenium into FePt system could reduce the ordering temperature and enhance its coercivity after annealing. We injected the third element source at different reaction temperatures in order to avoid the nucleation of Pt-Ru seeds before the nucleation of Fe-Pt ones. From the XRD and EDX spectrum, Fe50Ru3Pt47 nanoparticles was synthesized successfully by adding third element source at 160℃, and the ordering temperature is at 600℃. It shows ferromagnetic measured by SQUID at 5K/room temperature.