The effect of electron flow on FePt nanoparticles under heat treatment

The FePt crystal phase transition to L10 requires a temperature of about 600 °C, but at this temperature the nanoparticles forming the samples gradually become bulk-like. To prevent interlocking of FePt nanoparticles at high temperature, the electron flux effect can be considered. It is a new and useful method for heat treatment of FePt nanoparticles. Actually, the existence of excess electrons is effective in limiting the increase of particle size. In this work, experimental and theoretical investigations have been performed to study the effect of electron irradiation during heat treatment on particle size. The experimental results show that the particle diameter at 700 °C does not exceed 300-400 nm in the presence of electron flux.