Direct Synthesis of Isolated L1₀ FePt Nanoparticles in a Robust TiO₂ Matrix via a Combined Sol–Gel/Pyrolysis Route

Co–Pt alloy nanoparticles produced using a template of nanoparticle array

“…One of the alternatives envisioned to replace the current high-density recording medium is a self-assembled magnetic nanoparticle system [2][3][4][5]. Among those, because of the high magnetocrystalline anisotropy of L1 0 ordered CoPt and FePt, their nanoparticles sized 1-10 nm have been fabricated by various means [5][6][7][8][9][10]. It has been demonstrated the particles can be arranged into a highly regular lattice using surfactant chemistry [10].…”

Space‐Confined Formation of FePt Nanoparticles in Ordered Mesoporous Silica SBA‐15

“…[4] Several methods were developed for the preparation of FePt nanoparticles [5,6] such as physical deposition processes on a support, [7][8][9] gas phase sintering techniques, [10] liquid phase polyol assisted synthesis [11,12] or in situ formation of FePt particles from precursors trapped in an inorganic matrix. [13] Significant efforts were made improving the polyol synthesis procedure [13][14][15] and using core-shell approaches. [16] However, syntheses at low temperature typically produce superparamagnetic cubic FePt with a disordered arrangement of the two metals and subsequent annealing is necessary to convert the cubic into the tetragonal phase.…”

Facile Generation of L10‐FePt Nanodot Arrays from a Nanopatterned Metallopolymer Blend of Iron and Platinum Homopolymers

“…This manifests the fact that the L1 0 phase FePt alloy NPs can be generated directly through pyrolysis of the as‐prepared metallopolymer blend without the need of any post‐annealing treatment. The reason for this phenomenon can be attributed to the effect of the decomposed organic fractions which acts as both the reducing agent and supporting matrix to facilitate the generation of chemically ordered L1 0 or face‐centered‐tetragonal (fct) phase FePt NPs, which is similar to the mechanism of the intermatrix synthetic approach for the one‐step synthesis of fct FePt particles reported recently . Intermatrix synthesis usually requires a chemically and thermally robust supporting matrix such as TiO 2 combined with organic ligands such as acetylacetonate ligands which act as the reducing agent and decomposes to reduce metal ions to the zero valent state .…”