Abstract

Synthesis of monodisperse iron-platinum (FePt) nanoparticles by reduction of platinum acetylacetonate and decomposition of iron pentacarbonyl in the presence of oleic acid and oleyl amine stabilizers is reported. The FePt particle composition is readily controlled, and the size is tunable from 3- to 10-nanometer diameter with a standard deviation of less than 5%. These nanoparticles self-assemble into three-dimensional superlattices. Thermal annealing converts the internal particle structure from a chemically disordered face-centered cubic phase to the chemically ordered face-centered tetragonal phase and transforms the nanoparticle superlattices into ferromagnetic nanocrystal assemblies. These assemblies are chemically and mechanically robust and can support high-density magnetization reversal transitions.

Keywords

Materials scienceTetragonal crystal systemNanocrystalNanoparticleDispersitySuperlatticeFerromagnetismIron pentacarbonylThermal decompositionParticle sizeChemical engineeringPlatinumAnnealing (glass)MagnetizationNanotechnologyCrystallographyCrystal structureCondensed matter physicsInorganic chemistryChemistryOrganic chemistryMetallurgyOptoelectronicsPolymer chemistryCatalysis

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Publication Info

Year
2000
Type
article
Volume
287
Issue
5460
Pages
1989-1992
Citations
6075
Access
Closed

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Shouheng Sun, C. B. Murray, D. Weller et al. (2000). Monodisperse FePt Nanoparticles and Ferromagnetic FePt Nanocrystal Superlattices. Science , 287 (5460) , 1989-1992. https://doi.org/10.1126/science.287.5460.1989

Identifiers

DOI
10.1126/science.287.5460.1989