Direct chemical synthesis of L1₀-FePtAu nanoparticles with high coercivity

Authors

Yongsheng Yu, University of Nebraska-Lincoln, Jilin UniversityFollow
Pinaki Mukherjee, University of Nebraska-LincolnFollow
Yuan Tian, University of Nebraska-Lincoln
Xingzhong Li, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

2014

Citation

Nanoscale 6, 2014

Abstract

We report a facile synthesis of hard magnetic L1₀-FePtAu nanoparticles by coreduction of Fe(acac)₃, Pt(acac)₂ (acac = acetylacetonate), and gold acetate in oleylamine. In the current reaction condition, NP sizes are controlled to be 5.5 to 11.0 nm by changing the amount of Au doping. When the Au composition in the NPs is higher than 14%, the hard magnetic NPs are directly obtained without any annealing. The highest coercivity of 12.15 kOe at room temperature could be achieved for the NPs with 32% Au doping, which is much higher than the coercivities reported by the previous studies on solution-synthesized FePt nanoparticles. The reported one-pot synthesis of L1₀-FePtAu NPs may help to build superstrong magnets for magnetic or data-storage applications.