Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles

FePt nanoparticles with a size of 3 nm and thermally stable room-temperature ferromagnetism are investigated. The monodisperse nanoparticles were prepared by chemical synthesis and a salt-matrix annealing technique. Structural and magnetic characterizations confirmed the phase transition from the disordered face-centered cubic structure to the L1(0) structure with the chemical ordering parameter of 0.62 +/- 0.05. Analysis in blocking temperature and fitting of temperature dependence of switching field reveals that the transformed 3 nm nanoparticles have a magnetic anisotropy constant of (2.8 +/- 0.2)x10(6) J/m(3), smaller than those for the bigger particles and the fully ordered L1(0) bulk phase. (C) 2007 American Institute of Physics.