Research Papers in Physics and Astronomy
Date of this Version
August 2007
Abstract
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 L10 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) x 106 J/m3, smaller than those for the bigger particles and the fully ordered L10 bulk phase.
Comments
Published by Am Inst of Physics. J. Appl. Phys. 102, 043913 2007. Copyright 2007. Permission to use. http://www.aip.org/.