Direct Fabrication and Assembly of Highly Ordered L10 Phase FePt Nanoparticles

摘要

Ferromagnetic nanoparticles have inspired intense research activities because of their potential applications as well as their fundamental importance. Chemically ordered L10 phase FePt nanoparticle is a typical example among them with high magnetocrystalline anisotropy for advanced media and other applications. Since the chemically disordered and magnetically soft phase (A1) is kinetically favored, conventional fabrication methods generally can only produce the A1 phase nanoparticles. High temperature thermal treatment is required for the phase transformation from A1 to L10, which results in particle agglomeration and size distribution broadening. Recent experiments and simulations further pointed out that there is an intrinsic particle size limitation from the thermodynamic and kinetic viewpoints for the synthesis of highly-ordered L10 phase FePt nanoparticles through the reported solid-state-phase transformation (1). A technique that can directly fabricate L10 phase FePt nanoparticles is physically required and technically important.